CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Restricted cash	$ 21,742	$ 11,789	$ 5,937	$ 6,192
Variable Interest Entity, Primary Beneficiary [Member]
Cash	22,765	20,685	20,382	30,449
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Cash	$ 21,564	$ 14,735	$ 12,141	$ 15,685