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Investments in Partnerships and LLCs - Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of operations for unconsolidated entities [Abstract]
Revenues	$ 103,960us-gaap_Revenues	$ 86,641us-gaap_Revenues	$ 51,447us-gaap_Revenues	$ 43,865us-gaap_Revenues	$ 54,025us-gaap_Revenues	$ 34,999us-gaap_Revenues	$ 29,556us-gaap_Revenues	$ 25,119us-gaap_Revenues
Net loss and comprehensive loss									(1,932)us-gaap_ProfitLoss	(8,272)us-gaap_ProfitLoss	(87,683)us-gaap_ProfitLoss
Loss (income) from unconsolidated entities	(6)	(5)	(6)	1	(17)	(7)	(15)	(63)	(16)	(101)	259
Variable Interest Entity, Not Primary Beneficiary [Member]
Liabilities and Partners' Capital: [Abstract]
AV Homes	$ 0				$ 1,200				$ 0	$ 1,200

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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