Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long term debt outstanding	$ 2,418,073
Total debt	2,103,056	$ 1,607,257
Less current portion	33,387	33,387
Total long-term debt	2,069,669	1,573,870
Convertible Debt \| 2021 Notes
Debt Instrument [Line Items]
Long term debt outstanding	242,112	575,000
Unamortized discount and debt issuance costs	(11,560)	(38,865)
Total debt	230,552	536,135
Convertible Debt \| 2024 Notes
Debt Instrument [Line Items]
Long term debt outstanding	575,000	575,000
Unamortized discount and debt issuance costs	(106,840)	(117,859)
Total debt	468,160	457,141
Convertible Debt \| 2026 Notes
Debt Instrument [Line Items]
Long term debt outstanding	1,000,000	0
Unamortized discount and debt issuance costs	(193,498)	0
Total debt	806,502	0
Term Loan
Debt Instrument [Line Items]
Total debt	$ 597,842	$ 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, 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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