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Real Estate and Intangible Assets (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
Property
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Jun. 30, 2011
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Feb. 29, 2012
South Hadley Massachusetts [Member]
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Jun. 30, 2012
South Hadley Massachusetts [Member]
Lease
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Jun. 30, 2012
San Antonio Texas [Member]
Lease
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Feb. 14, 2012
San Antonio Texas [Member]
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Jun. 30, 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. 27, 2012
Hialeah Florida [Member]
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Jun. 30, 2012
Five properties acquired [Member]
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Jun. 30, 2012
Five properties acquired [Member]
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| Real Estate and Intangible Assets (Textual) [Abstract] | ||||||||||||||
| Number of properties acquired | 5 | |||||||||||||
| Acquisition-related costs excluded in pro-forma earnings | $ 528,000 | $ 131,000 | $ 688,000 | $ (8,000) | $ 500,000 | $ 500,000 | ||||||||
| Amount failed to pay for property annualized taxes | 8,000,000 | |||||||||||||
| Period for lease expiration | 2012-02 | 2014-02 | 2012-12 | 2022-03 | ||||||||||
| Number of available options to extend lease for additional periods | 1 | 2 | 1 | |||||||||||
| Option to extend lease term | 1 year | 8 years | 5 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 | |||||||||||
| Tenant allowance | 600,000 | 400,000 | 300,000 | |||||||||||
| Period of tenant allowance payable | 2 years | 2 years | ||||||||||||
| Leasing commission paid | 1,101,000 | 300,000 | 800,000 | |||||||||||
| Future annualized rents | $ 1,200,000 | |||||||||||||
| Option to extend lease term | 5 years | |||||||||||||