Real Estate Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended		0 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2012 Maximum [Member]	Jul. 12, 2012 Florida Warehouse [Member] Subsequent Event [Member]	Jun. 30, 2012 Land [Member]	Jun. 30, 2012 Building and Improvements [Member]	Jun. 30, 2011 Building and Improvements [Member]	Jun. 30, 2012 Building and Improvements [Member]	Jun. 30, 2011 Building and Improvements [Member]	Jun. 30, 2012 Land, Buildings and Improvements [Member]
Schedule of Investments [Line Items]
Land	$ 20,092		$ 20,092		$ 21,312
Building and improvements	63,068		63,068		67,487
Intangibles	326		326		300
Subtotal	83,486		83,486		89,099
Less accumulated depreciation and amortization	10,408		10,408		10,557
Property, Plant and Equipment, Net	73,078		73,078		78,542
Estimated useful life						5 years	39 years
Assets Held-for-sale, Long Lived [Abstract]
Subsequent event, purchase and sale agreement								5,821
Depreciation and amortization	8,326	7,792	16,634	15,586						28	28	57	57
Long-lived assets held for sale, gross									1,220	4,441		4,441		5,661
Accumulated depreciation, long-lived assets										1,053		1,053
Long-lived assets held-for-sale	$ 4,608		$ 4,608		$ 0