Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Less - unamortized original issue discount	$ (8,897)	$ (10,053)
Total debt, net of unamortized discounts	356,103	356,822
Current portion of long-term debt, net of unamortized discounts	(11,250)	(10,313)
Long-term debt, net of unamortized discounts	344,853	346,509
2018 Credit Agreement | 2018 Term Loan
Debt Instrument [Line Items]
Total long-term debt, gross	135,000	136,875
Less – deferred financing costs	(1,574)	(1,715)
Total debt, net of unamortized discounts	133,426	135,160
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Total long-term debt, gross	230,000	230,000
Less - unamortized original issue discount	(5,274)	(6,004)
Less – deferred financing costs	(2,049)	(2,334)
Total debt, net of unamortized discounts	$ 222,677	$ 221,662