Debt - Recorded Expenses with Respect to Long-term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Interest expense	$ 33,119	$ 35,591	$ 31,724
Debt extinguishment charges	0	25,006	9,552
Amortization of debt issuance costs	3,206	3,537	3,665
Commitment fee	1,452	1,506	1,575
Accelerated amortization of debt issuance costs	738	0	0
Accelerated interest expense on repurchase of debt	298	0	0
Total	$ 38,813	$ 65,640	$ 46,516