Investment in Unconsolidated LLCs Investment in Unconsolidated LLCs (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Company's contributed capital	$ 11,732,000
Capitalized interest and other costs included in investment in Unconsolidated LLCs	806,000	800,000
Reduction of Impairment Relating to LLCs	12,500,000	12,100,000
Total equity in (loss) income	$ (12,000)	$ (22,000)	$ 300,000