Real Estate Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Schedule of Investments [Line Items]
Land	$ 18,892		$ 18,892		$ 21,312
Building and improvements	54,383		54,383		67,487
Intangibles	329		329		300
Subtotal	73,604		73,604		89,099
Less accumulated depreciation and amortization	8,697		8,697		10,557
Total	64,907		64,907		78,542
Sale of warehouse building			5,517	0
Gain on sale of real estate investment	910	0	910	0
Assets Held-for-sale, Long Lived [Abstract]
Depreciation and amortization	8,288	7,803	24,922	23,389
Long-lived assets held-for-sale	7,768		7,768		0
Minimum [Member]
Schedule of Investments [Line Items]
Estimated useful life			5 years
Maximum [Member]
Schedule of Investments [Line Items]
Estimated useful life			39 years
Florida Warehouse [Member]
Schedule of Investments [Line Items]
Sale of warehouse building	5,821
Gain on sale of real estate investment	910
Selling expenses	304
Land [Member]
Assets Held-for-sale, Long Lived [Abstract]
Long-lived assets held for sale, gross	1,200		1,200
Building and Improvements [Member]
Assets Held-for-sale, Long Lived [Abstract]
Depreciation and amortization	56	56	167	167
Long-lived assets held for sale, gross	8,684		8,684
Accumulated depreciation, long-lived assets	2,116		2,116
Land, Buildings and Improvements [Member]
Assets Held-for-sale, Long Lived [Abstract]
Long-lived assets held for sale, gross	$ 9,884		$ 9,884