Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 15, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Less – unamortized original issue discount	$ (25,322)		$ (4,738)
Less – unamortized original issue discount	(1,469)		(8,632)
Total debt, net of unamortized discounts	385,781		279,130
Current portion of long-term debt, net of unamortized discounts	(53,603)		(148,868)
Long-term debt, net of unamortized discounts	332,178		130,262
Credit Agreement | Term Loan
Debt Instrument [Line Items]
Total long-term debt, gross	138,750		142,500
Less - deferred financing costs	(4,111)		(4,738)
Total debt, net of unamortized discounts	134,639		137,762
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Total long-term debt, gross	230,000
Less – unamortized original issue discount	(15,212)	$ (15,900)
Less - deferred financing costs	(5,999)
Total debt, net of unamortized discounts	208,789
Senior Subordinated Convertible Notes 2010
Debt Instrument [Line Items]
Total long-term debt, gross	43,822		150,000
Less – unamortized original issue discount	(1,348)		(7,923)
Less – deferred financing costs	(121)		(709)
Total debt, net of unamortized discounts	$ 42,353		$ 141,368