Debt - Carrying Amount of Liability Component (Details) - Convertible Debt - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 932	$ 620
2025 Notes
Debt Instrument [Line Items]
Principal	230,000		$ 230,000
Unamortized debt issuance costs	(4,575)		(4,905)
Total	225,425		225,095
Amortization of debt issuance costs	330	319
2027 Notes
Debt Instrument [Line Items]
Principal	600,000		600,000
Unamortized debt issuance costs	(12,430)		(13,032)
Total	587,570		$ 586,968
Amortization of debt issuance costs	$ 602	$ 80

Amount of amortization expense attributable to debt issuance costs.

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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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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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