Investments in Unconsolidated Joint Ventures - Financial Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Other assets	$ 32,921	$ 21,164
Total assets	2,626,406	2,061,104
LIABILITIES AND EQUITY
Accounts payable	88,853	58,799
Accrued expenses	99,378	111,491
Total liabilities and equity	2,626,406	2,061,104
Joint Ventures
ASSETS
Cash	6,996	12,802
Loans held for sale	16,489	17,106
Accounts receivable	698	2,791
Other assets	102	128
Total assets	24,285	32,827
LIABILITIES AND EQUITY
Accounts payable	292	779
Accrued expenses	892	1,532
Credit lines payable	15,601	18,312
Other liabilities	251	31
Members equity	7,249	12,173
Total liabilities and equity	$ 24,285	$ 32,827