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Convertible Senior Notes - Interest expense (Details) - 2.75% Convertible Senior Notes due 2027 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Long-Term Debt
Contractual interest expense	$ 7,906	$ 4,370
Amortization of debt discount		5,610
Amortization of debt issuance costs	1,373	364
Total interest expense	$ 9,279	$ 10,344
Interest rate at period end	3.20%	3.20%
Unamortized debt issuance costs			$ 6,300

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- Definition

Represents the charge against earnings during the period for debt interest expense and amortization of debt issuance costs and amortization of debt discount.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

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

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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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