Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Cash payments for interest	$ 197,384	$ 55,028	$ 28,338
Cash payments for income taxes	$ 2,875	$ 1,409	$ 456