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Real Estate Investments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Feb. 01, 2013
Connecticut Warehouse [Member]
Schedule of Investments [Line Items]                
Land $ 18,892   $ 18,892   $ 18,892      
Building and improvements 59,047   59,047   55,011      
Intangibles 329   329   329      
Subtotal 78,268   78,268   74,232      
Less accumulated depreciation and amortization 9,839   9,839   9,045      
Total 68,429   68,429   65,187      
Estimated useful life           5 years 39 years  
Proceeds from sale of warehouse               9,200
Gain on sale of real estate investment 0 0 1,063 0       1,063
Selling expenses               $ 369