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Debt - Summary of Net Carrying Amount of Convertible Notes (Details) - 1.75% Senior Notes Due 2026 - Senior Notes - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Apr. 28, 2020
Line of Credit Facility
Principal	$ 500,000	$ 500,000	$ 500,000
Less: Unamortized debt discount	119,105	129,103
Less: Unamortized debt issuance costs	10,562	11,263
Net carrying value of Convertible Notes	$ 370,333	$ 359,634

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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