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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Finance lease and other obligations $ 286,600 $ 305,600
Total debt obligations 1,253,400 1,444,800
Less unamortized deferred financing costs (10,900) (12,400)
Total debt, net of deferred financing costs 1,242,500 1,432,400
Current portion of long-term debt 126,697 118,429
Long-term debt $ 1,115,839 1,314,030
Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of credit facility, maturity date Sep. 19, 2024  
Credit Facility [Member] | Revolving Loans [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations $ 166,800 339,200
Credit Facility [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations 400,000 400,000
Senior Notes [Member] | 4.875% Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations $ 400,000 $ 400,000
Debt instrument, interest rate (percentage) 4.875%  
Debt instrument, maturity date Mar. 15, 2023