CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted cash	$ 30,668	$ 11,789
Variable Interest Entity, Primary Beneficiary [Member]
Cash	25,211	20,685	$ 30,449	$ 35,106
Restricted cash	30,668	11,789	6,192	7,212
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Cash	$ 20,104	$ 14,735	$ 15,685	$ 17,447