Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Line of Credit (Details)

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Mortgage Notes Payable and Line of Credit (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Company's mortgage notes payable and line of credit    
Accrues interest maturity date Oct. 01, 2022  
Principal Balance Outstanding $ 975  
Premiums and (Discounts), net: 68 (843)
Total Fixed-Rate Mortgage Notes Payable: 337,931 285,350
Variable-Rate Line of Credit: 5,500 18,700
Total Mortgage Notes Payable and Line of Credit 343,431 [1] 304,050
Mortgage Notes Payable One [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Sep. 15, 2008  
Accrues interest maturity date Oct. 01, 2012  
Accrues interest at a fixed rate 4.76%  
Principal Balance Outstanding 45,233 45,233
Mortgage Notes Payable Two [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Feb. 21, 2006  
Accrues interest maturity date Dec. 01, 2013  
Accrues interest at a fixed rate 5.91%  
Principal Balance Outstanding 8,707 8,845
Mortgage Notes Payable Three [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Feb. 21, 2006  
Accrues interest maturity date Jun. 30, 2014  
Accrues interest at a fixed rate 5.20%  
Principal Balance Outstanding 18,037 18,345
Mortgage Notes Payable Four [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Aug. 25, 2005  
Accrues interest maturity date Sep. 01, 2015  
Accrues interest at a fixed rate 5.33%  
Principal Balance Outstanding 20,167 20,431
Mortgage Notes Payable Five [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Sep. 12, 2005  
Accrues interest maturity date Sep. 01, 2015  
Accrues interest at a fixed rate 5.21%  
Principal Balance Outstanding 11,872 12,019
Mortgage Notes Payable Six [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Dec. 21, 2005  
Accrues interest maturity date Dec. 08, 2015  
Accrues interest at a fixed rate 5.71%  
Principal Balance Outstanding 18,231 18,448
Mortgage Notes Payable Seven [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Sep. 06, 2007  
Accrues interest maturity date Dec. 11, 2015  
Accrues interest at a fixed rate 5.81%  
Principal Balance Outstanding 4,161 4,219
Mortgage Notes Payable Eight [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Mar. 29, 2006  
Accrues interest maturity date Apr. 01, 2016  
Accrues interest at a fixed rate 5.92% [1]  
Principal Balance Outstanding 16,772 16,871
Mortgage Notes Payable Nine [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Apr. 27, 2006 [1]  
Accrues interest maturity date May 05, 2016  
Accrues interest at a fixed rate 6.58%  
Principal Balance Outstanding 13,166 13,409
Mortgage Notes Payable Ten [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Aug. 29, 2008  
Accrues interest maturity date Jun. 01, 2016  
Accrues interest at a fixed rate 6.80%  
Principal Balance Outstanding 5,905 6,019
Mortgage Notes Payable Eleven [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Jun. 20, 2011  
Accrues interest maturity date Jun. 30, 2016  
Accrues interest at a fixed rate 6.08%  
Principal Balance Outstanding 11,384 11,505
Mortgage Notes Payable Twelve [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Nov. 22, 2006  
Accrues interest maturity date Dec. 01, 2016  
Accrues interest at a fixed rate 5.76%  
Principal Balance Outstanding 13,611 13,761
Mortgage Notes Payable Thirteen [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Dec. 22, 2006  
Accrues interest maturity date Jan. 01, 2017  
Accrues interest at a fixed rate 5.79%  
Principal Balance Outstanding 20,811 21,037
Mortgage Notes Payable Fourteen [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Feb. 08, 2007  
Accrues interest maturity date Mar. 01, 2017  
Accrues interest at a fixed rate 6.00%  
Principal Balance Outstanding 13,775 13,775
Mortgage Notes Payable Fifteen [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Jun. 05, 2007  
Accrues interest maturity date Jun. 08, 2017  
Accrues interest at a fixed rate 6.11%  
Principal Balance Outstanding 14,203 14,240
Mortgage Notes Payable Sixteen [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Oct. 15, 2007  
Accrues interest maturity date Nov. 08, 2017  
Accrues interest at a fixed rate 6.63%  
Principal Balance Outstanding 15,126 15,278
Mortgage Notes Payable Seventeen [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Sep. 26, 2012  
Accrues interest maturity date Jul. 01, 2018  
Accrues interest at a fixed rate 5.75%  
Principal Balance Outstanding 10,741  
Mortgage Notes Payable Eighteen [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Nov. 18, 2011  
Accrues interest maturity date Nov. 01, 2018 [1]  
Accrues interest at a fixed rate 4.50%  
Principal Balance Outstanding 4,280 [1] 4,352
Mortgage Notes Payable Nineteen [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Dec. 06, 2011  
Accrues interest maturity date Dec. 06, 2019  
Accrues interest at a fixed rate 6.00%  
Principal Balance Outstanding 8,331 8,500
Mortgage Notes Payable Twenty [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Oct. 28, 2011  
Accrues interest maturity date Nov. 01, 2021  
Accrues interest at a fixed rate 6.00%  
Principal Balance Outstanding 7,100 7,190 [2]
Mortgage Notes Payable Twenty One [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Apr. 05, 2012  
Accrues interest maturity date May 01, 2022  
Accrues interest at a fixed rate 6.10%  
Principal Balance Outstanding 18,901  
Mortgage Notes Payable Twenty Two [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Jun. 21, 2012  
Accrues interest maturity date Jul. 06, 2022  
Accrues interest at a fixed rate 5.05%  
Principal Balance Outstanding 4,735  
Mortgage Notes Payable Twenty Three [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Aug. 03, 2012  
Accrues interest maturity date Jul. 31, 2022  
Accrues interest at a fixed rate 5.00%  
Principal Balance Outstanding 2,994  
Mortgage Notes Payable Twenty Four [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Jul. 24, 2012  
Accrues interest maturity date Aug. 01, 2022  
Accrues interest at a fixed rate 5.60%  
Principal Balance Outstanding 9,729  
Mortgage Notes Payable Twenty Five [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Dec. 15, 2010  
Accrues interest maturity date Dec. 10, 2026  
Accrues interest at a fixed rate 6.63%  
Principal Balance Outstanding 10,090 10,402
Mortgage Notes Payable Twenty Six [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption May 16, 2012  
Accrues interest maturity date Dec. 31, 2026  
Accrues interest at a fixed rate 4.30%  
Principal Balance Outstanding 2,913  
Mortgage Notes Payable Twenty Seven [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption May 30, 2012  
Accrues interest maturity date May 10, 2027  
Accrues interest at a fixed rate 6.50%  
Principal Balance Outstanding 4,934  
Mortgage Notes Payable Twenty Eight [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Jun. 27, 2012  
Accrues interest maturity date Jul. 01, 2029  
Accrues interest at a fixed rate 5.10%  
Principal Balance Outstanding 2,004  
Mortgage Notes Payable Twenty Nine [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Mar. 16, 2005  
Accrues interest maturity date Apr. 01, 2030  
Accrues interest at a fixed rate 6.33%  
Principal Balance Outstanding   2,314
Mortgage Notes Payable [Member]
    
Company's mortgage notes payable and line of credit    
Principal Balance Outstanding 337,863 286,193
Variable-Rate Line of Credit [Member]
    
Company's mortgage notes payable and line of credit    
Date of Issuance/ Assumption Dec. 28, 2010  
Accrues interest maturity date Dec. 28, 2013  
Variable-Rate Line of Credit, Stated Interest Rate LIBOR +2.75%  
Variable-Rate Line of Credit: $ 5,500 $ 18,700
[1] (1) Refer to Note 2 Related-Party Transactions
[2] (2) Refer to Note 7 "Commitments and Contingencies"