Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Components of Long-term debt
Long-term debt		$ 399,143	$ 196,373
Debt issuance costs on term loan		(3,325)	(1,627)
Net term loan		391,175	196,373
Current portion of long-term debt		6,656	2,000
Long-term debt (less current portion)		392,487	194,373
Fair value of long-term debt	[1]	396,576	194,000
Revolving Credit Facility
Components of Long-term debt
Long-term debt		0	0
Term loan
Components of Long-term debt
Long-term debt		394,500	198,000
Unsecured Deb
Components of Long-term debt
Long-term debt		$ 7,968	$ 0

[1] Fair value of the term loan was estimated based on quoted private market transactions and is classified as Level 1 in the fair value hierarchy.