Investments in Partnerships and LLCs - Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Assets: [Abstract]
Total Assets	$ 655,942		$ 655,942		$ 466,728
Liabilities and Partners' Capital: [Abstract]
Total Liabilities and Equity	655,942		655,942		466,728
Statement of operations for unconsolidated entities [Abstract]
Net loss (including net gain or loss attributable to non-controlling interests)	(2,253)	(4,668)	(3,885)	(9,427)
Equity in earnings (loss) from unconsolidated entities	(6)	(15)	(5)	(78)
Variable Interest Entity, Not Primary Beneficiary [Member]
Liabilities and Partners' Capital: [Abstract]
AV Homes	$ 14,610		$ 14,610		$ 1,230