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Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 1,582,161 $ 1,581,038
Less current portion 45,117 40,605
Total long-term debt 1,537,044 1,540,433
Convertible Debt | 2021 Notes    
Debt Instrument [Line Items]    
Long term debt outstanding 575,000 575,000
Unamortized discount and debt issuance costs (76,668) (81,627)
Total debt 498,332 493,373
Convertible Debt | 2024 Notes    
Debt Instrument [Line Items]    
Long term debt outstanding 575,000 575,000
Unamortized discount and debt issuance costs (153,908) (158,680)
Total debt 421,092 416,320
Term Loan    
Debt Instrument [Line Items]    
Total debt $ 662,737 $ 671,345