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Real Estate and Intangible Assets (Details Textual) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
Property
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Sep. 30, 2011
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Feb. 29, 2012
San Antonio Texas [Member]
Lease
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Feb. 14, 2012
San Antonio Texas [Member]
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Feb. 29, 2012
Roseville Minnesota [Member]
Lease
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Feb. 27, 2012
Roseville Minnesota [Member]
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Jun. 30, 2012
Hialeah Florida [Member]
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Jun. 29, 2012
Hialeah Florida [Member]
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Aug. 31, 2012
Wichita Kansas [Member]
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Aug. 07, 2012
Wichita Kansas [Member]
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Sep. 30, 2012
South Hadley Massachusetts [Member]
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Sep. 30, 2012
Mason Ohio [Member]
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Sep. 11, 2012
Mason Ohio [Member]
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Sep. 30, 2012
Arlington Texas [Member]
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Sep. 30, 2012
Six properties acquired [Member]
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Sep. 30, 2012
Six properties acquired [Member]
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| Real Estate and Intangible Assets (Textual) [Abstract] | ||||||||||||||||||
| Number of properties acquired | 6 | |||||||||||||||||
| Acquisition-related costs excluded in pro-forma earnings | $ 117,000 | $ 201,000 | $ 805,000 | $ 194,000 | $ 600,000 | $ 600,000 | ||||||||||||
| Amount failed to pay for property annualized taxes | 8,200,000 | |||||||||||||||||
| Period for lease expiration | 2014-02 | 2012-12 | 2022-03 | 2012-09 | 2013-02 | 2013-01 | 2013-04 | |||||||||||
| Number of available options to extend lease for additional periods | 2 | 1 | ||||||||||||||||
| Option to extend lease term | 7 years | 5 years | 5 years | 5 years | 1 year | 7 years | 5 years | |||||||||||
| Option to extend lease term one | 5 years | |||||||||||||||||
| Option to extend lease term two | 5 years | |||||||||||||||||
| Amount of annualized straight line rents over the life of the lease | 300,000 | |||||||||||||||||
| Capital lease rent expense | 800,000 | 2,900,000 | 1,100,000 | 800,000 | 600,000 | |||||||||||||
| Tenant allowance | 600,000 | 400,000 | 300,000 | 500,000 | ||||||||||||||
| Period of tenant allowance payable | 2 years | 2 years | ||||||||||||||||
| Leasing commission paid | 1,538,000 | 300,000 | 800,000 | 200,000 | 300,000 | |||||||||||||
| Future annualized rents | $ 1,200,000 | |||||||||||||||||
| Option to extend lease term | 5 years | |||||||||||||||||