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Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2019
Debt Instrument [Line Items]      
Long-term principal $ 762,235 $ 762,235  
Debt issuance costs (1,857) (2,086) $ (500)
Unamortized discounts (3,031) (3,680)  
Total long-term debt 757,347 756,469  
Less: current portion of long-term debt (39,981) (45,974)  
Long-term debt 717,366 710,495  
Variable Rate Term Loans [Member]      
Debt Instrument [Line Items]      
Long-term principal 403,500 397,500  
Fixed Rate Term Loans [Member]      
Debt Instrument [Line Items]      
Long-term principal 290,000 296,000  
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