Unconsolidated Joint Ventures - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 41,957	$ 81,224
Cost of sales	35,904	63,798
Gross margin	6,053	17,426
Operating expenses	3,912	6,660
Net income of unconsolidated joint ventures	2,141	10,766
Equity in net income (loss) of unconsolidated joint ventures reflected in the accompanying consolidated statements of operations	$ (7)	$ 1,868