Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long term debt outstanding	$ 1,759,308
Total debt	1,610,371	$ 1,607,257
Less current portion	33,387	33,387
Total long-term debt	1,576,984	1,573,870
Convertible Debt \| 2021 Notes
Debt Instrument [Line Items]
Long term debt outstanding	575,000	575,000
Unamortized discount and debt issuance costs	(33,152)	(38,865)
Total debt	541,848	536,135
Convertible Debt \| 2024 Notes
Debt Instrument [Line Items]
Long term debt outstanding	575,000	575,000
Unamortized discount and debt issuance costs	(112,389)	(117,859)
Total debt	462,611	457,141
Term Loan
Debt Instrument [Line Items]
Total debt	$ 605,912	$ 613,981

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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