Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term principal	$ 762,235	$ 762,235
Debt issuance costs	(1,598)	(1,857)
Unamortized discounts	(2,381)	(3,031)
Total long-term debt	758,256	757,347
Less: current portion of long-term debt	(42,977)	(39,981)
Long-term debt	715,279	717,366
Variable Rate Term Loans [Member]
Debt Instrument [Line Items]
Long-term principal	403,500	403,500
Fixed Rate Term Loans [Member]
Debt Instrument [Line Items]
Long-term principal	290,000	290,000
Revenue Bonds [Member]
Debt Instrument [Line Items]
Long-term principal	65,735	65,735
Medium Term Notes [Member]
Debt Instrument [Line Items]
Long-term principal	$ 3,000	$ 3,000

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

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