Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Cash and cash equivalents		$ 405,078	$ 401,719
Restricted cash	[1]	226,818	242,570
Total cash, cash equivalents and restricted cash		$ 631,896	$ 644,289	$ 683,341	$ 693,412

[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.