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Debt (Long-term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Oct. 07, 2020	Nov. 15, 2019	Jun. 10, 2014
Debt Instrument [Line Items]
Less: Unamortized discount	$ (106,411)	$ (112,798)
Deferred issuance costs	(10,581)	(11,505)
Total debt	1,586,331	1,579,021
Less: current portion	(399,893)	(396,801)
Total long-term debt, less current portion	1,186,438	1,182,220
Senior Notes | 4.625% Senior Notes
Debt Instrument [Line Items]
Stated interest rate			4.625%
Total Notes	750,000	750,000
Convertible Debt
Debt Instrument [Line Items]
Total Notes	1,702,413	1,702,414
Convertible Debt | 3.25% Convertible Notes
Debt Instrument [Line Items]
Stated interest rate					3.25%
Total Notes	402,413	402,414
Convertible Debt | 1.75% Convertible Notes
Debt Instrument [Line Items]
Stated interest rate				1.75%
Total Notes	550,000	550,000
Deferred issuance costs				$ (2,800)
Loans Payable | Paycheck Protection Program, CARES Act
Debt Instrument [Line Items]
Total Notes	$ 910	$ 910

X

- Definition

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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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount (premium).

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