Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 15, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Less – unamortized original issue discount	$ (24,169)		$ (4,738)
Less – unamortized original issue discount	(734)		(8,632)
Total debt, net of unamortized discounts	376,704		279,130
Current portion of long-term debt, net of unamortized discounts	(47,123)		(148,868)
Long-term debt, net of unamortized discounts	329,581		130,262
Credit Agreement | Term Loan
Debt Instrument [Line Items]
Total long-term debt, gross	136,875		142,500
Less - deferred financing costs	(3,800)		(4,738)
Total debt, net of unamortized discounts	133,075		137,762
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Total long-term debt, gross	230,000
Less – unamortized original issue discount	(14,612)	$ (15,900)
Less - deferred financing costs	(5,757)
Total debt, net of unamortized discounts	209,631
Senior Subordinated Convertible Notes 2010
Debt Instrument [Line Items]
Total long-term debt, gross	34,732		150,000
Less – unamortized original issue discount	(674)		(7,923)
Less – deferred financing costs	(60)		(709)
Total debt, net of unamortized discounts	$ 33,998		$ 141,368