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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Finance lease and other obligations $ 313,100 $ 288,500
Total debt obligations 1,598,000 1,318,700
Less unamortized deferred financing costs (14,400) (16,000)
Total debt, net of deferred financing costs 1,583,600 1,302,700
Current portion of long-term debt 163,116 145,110
Long-term debt 1,420,460 1,157,632
Credit Facility | Revolving Loans    
Debt Instrument [Line Items]    
Long-term debt obligations 292,400 32,700
Credit Facility | Term Loan    
Debt Instrument [Line Items]    
Long-term debt obligations 392,500 397,500
Senior Notes | 4.50% Senior Notes    
Debt Instrument [Line Items]    
Long-term debt obligations $ 600,000 $ 600,000
Debt instrument, interest rate (percentage) 4.50% 4.50%