Long Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Finance Lease, Liability	$ 162	$ 230
Long-term Debt and Lease Obligation, Including Current Maturities	1,064,969	1,054,822
Current portion of long-term debt	69,693	69,746
Long-term debt	995,276	985,076
Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	79,000	70,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	133,910	133,858
Unamortized Debt Issuance Expense	678	729
2.625 Percent Convertible Notes Due 2024 \| Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Convertible Debt	69,668	69,568
Unamortized Debt Issuance Expense	332	432
2.250 Percent Convertible Notes Due 2027 \| Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Convertible Debt	782,229	781,166
Unamortized Debt Issuance Expense	$ 17,771	$ 18,834

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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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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