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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

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

+ References

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- Definition

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.

+ References

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Liabilities - Convertible Senior Notes Carrying Value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	May 18, 2020	Jan. 10, 2017
Debt
Principal amount	$ 389,195	$ 389,195
Unamortized debt discount/transaction costs	(60,980)	(68,080)
Net carrying value	328,215	321,115
2023 Notes
Debt
Principal amount	131,695	131,695		$ 345,000
Unamortized debt discount/transaction costs	(9,171)	(11,925)
Net carrying value	122,524	119,770
2025 Notes
Debt
Principal amount	132,500	132,500
Unamortized debt discount/transaction costs	(19,749)	(22,097)
Net carrying value	112,751	110,403
2027 Notes
Debt
Principal amount	125,000	125,000	$ 125,000
Unamortized debt discount/transaction costs	(32,060)	(34,058)
Net carrying value	$ 92,940	$ 90,942