Long-Term Debt - Long-term debt and lease financing obligations (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 4,856,000	$ 57,297,000
Long-term debt, net	225,144,000	172,703,000
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Long-term debt, net		51,012,000
Unamortized Debt Issuance Expense		51,012,000
Cumulative Effect, Period of Adoption, Adjusted Balance
Debt Instrument [Line Items]
Long-term debt, net		223,715,000
Unamortized Debt Issuance Expense		(6,285,000)
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Outstanding Principal Of Convertible Debt	$ 230,000,000	230,000,000
Convertible Senior Notes Due 2025 \| Cumulative Effect, Period of Adoption, Adjusted Balance
Debt Instrument [Line Items]
Outstanding Principal Of Convertible Debt		$ 230,000,000

Outstanding Principal Of Convertible Debt

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

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Amount of long-term debt and lease obligation, classified as noncurrent.

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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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