Summary of Significant Accounting Policies (Real Estate Investments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				3 Months Ended	12 Months Ended						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 05, 2012	Sep. 30, 2012 Florida Warehouse [Member]	Dec. 31, 2012 Building [Member]	Dec. 31, 2011 Building [Member]	Dec. 31, 2010 Building [Member]	Dec. 31, 2012 Land [Member]	Dec. 31, 2012 Land, Buildings and Improvements [Member]	Dec. 31, 2012 Building and Building Improvements [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Land and Building [Member]	Dec. 31, 2011 Land and Building [Member]
Components of Real Estate Investments [Abstract]
Land	$ 18,892	$ 21,312
Buildings and improvements	55,011	67,487
Intangibles	329	300
Total real estate investment	74,232	89,099
Estimated useful life												5 years	39 years
Sale of warehouse building					5,821
Gain on sale of real estate investment	910	0	0		910
Selling expense					304
Amount of purchase and sale agreement				9,200
Depreciation						167	223	223
Assets Held-for-sale, Long Lived [Abstract]
Long-lived assets held for sale, gross									1,200	9,884	8,684
Accumulated depreciation, long-lived assets											2,116
Long-lived assets held-for-sale	7,768	0
Assets Leased or Available for Lease [Abstract]
Assets leased or available for lease														72,838	87,704
Operating Leases, Future Minimum Payments Receivable [Abstract]
2013	4,767
2014	5,355
2015	5,470
2016	5,626
2017	5,723
Thereafter	$ 34,931