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Debt - Changes to the notes (Details) - Convertible Senior Notes Due 2026 - Senior Notes - USD ($)	Mar. 31, 2021	Mar. 09, 2021
Line Of Credit Facility
Convertible senior notes	$ 600,000,000	$ 600,000,000
Less unamortized debt discount	(5,934,000)	$ (6,000,000.0)
Less unamortized debt issuance costs	(2,583,000)
Carrying value as of March 31, 2021	$ 591,483,000

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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

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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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