Investments in Unconsolidated Real Estate Partnerships - (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial information for the unconsolidated real estate partnerships
Real estate, net of accumulated depreciation	$ 81,364	$ 88,014	$ 107,419
Total assets	85,492	93,242	114,658
Non-recourse property debt and other notes payable	51,863	60,660	122,019
Total liabilities	54,472	64,859	132,767
Partners’ capital (deficit)	31,020	28,383	(18,109)
Rental and other property revenues	12,978	16,268	72,636
Property operating expenses	(6,233)	(8,470)	(49,331)
Depreciation and amortization	(3,081)	(3,300)	(18,388)
Interest expense	(2,785)	(4,185)	(21,354)
Gain on sale and impairment losses, net	0	36,212	(4,140)
Net income (loss)	$ 688	$ 35,909	$ (21,108)