Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 15, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Less – unamortized original issue discount	$ (23,007)		$ (4,738)
Less – unamortized original issue discount	(296)		(8,632)
Total debt, net of unamortized discounts	376,419		279,130
Current portion of long-term debt, net of unamortized discounts	(49,426)		(148,868)
Long-term debt, net of unamortized discounts	326,993		130,262
Credit Agreement | Term Loan
Debt Instrument [Line Items]
Total long-term debt, gross	135,000		142,500
Less - deferred financing costs	(3,489)		(4,738)
Total debt, net of unamortized discounts	131,511		137,762
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Total long-term debt, gross	230,000
Less – unamortized original issue discount	(14,005)	$ (15,900)
Less - deferred financing costs	(5,513)
Total debt, net of unamortized discounts	210,482
Senior Subordinated Convertible Notes 2010
Debt Instrument [Line Items]
Total long-term debt, gross	34,722		150,000
Less – unamortized original issue discount	(272)		(7,923)
Less – deferred financing costs	(24)		(709)
Total debt, net of unamortized discounts	$ 34,426		$ 141,368