Debt (Schedule of Convertible Notes) (Details) - Convertible notes $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Long-Term Debt
Principal	$ 1,725,000
Less: Unamortized debt discount and transaction costs	312,117
Carrying value	1,412,883
Contractual interest expense	30,832
Amortization of debt discount and transaction costs	52,518
Interest expense	$ 83,350

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Face (par) amount of debt instrument at time of issuance.

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

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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