Investments in Unconsolidated Joint Ventures Investments in Unconsolidated Joint Ventures - Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total operating revenue	$ 397,162	$ 246,811	$ 247,740	$ 189,715	$ 352,479	$ 196,305	$ 169,868	$ 140,299	$ 1,106,552	$ 896,679	$ 572,535
Cost of sales									(1,025,534)	(820,809)	(516,678)
Income of unconsolidated joint ventures									81,018	75,870	55,857
Equity in income of unconsolidated joint ventures									3,239	555	0
Other assets, net	21,017				18,562				21,017	18,562
Total assets	1,923,450				1,659,724				1,923,450	1,659,724
Accounts payable	75,881				51,814				75,881	51,814
Accrued expenses	70,324				85,366				70,324	85,366
Total Liabilities and Equity	1,923,450				1,659,724				1,923,450	1,659,724
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Total operating revenue									12,314	2,015	0
Cost of sales									(5,842)	(906)	0
Income of unconsolidated joint ventures									6,472	1,109	$ 0
Cash	6,340				765				6,340	765
Loans held for sale	29,312				0				29,312	0
Accounts receivable	309				71				309	71
Other assets, net	390				29				390	29
Total assets	36,351				865				36,351	865
Accounts payable	651				404				651	404
Accrued expenses	774				161				774	161
Credit lines payable	27,350				0				27,350	0
Other liabilities	515				0				515	0
Members equity	7,061				300				7,061	300
Total Liabilities and Equity	$ 36,351				$ 865				$ 36,351	$ 865