Other Supplemental Information - Schedule of Cash, Cash Equivalents and Restricted Cash Recorded in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 613,534	$ 80,171
Restricted cash	2,517	58,715
Cash, cash equivalents and restricted cash	$ 616,051	$ 138,886	$ 258,721	$ 192,460