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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Finance lease and other obligations $ 255,100 $ 183,200
Total long-term debt obligations 1,366,300 1,417,000
Less unamortized deferred financing costs (8,600) (10,100)
Total debt, net of deferred financing costs 1,357,700 1,406,900
Current portion of long-term debt 106,882 82,655
Long-term debt $ 1,250,812 1,324,223
Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of credit facility, maturity date Feb. 22, 2022  
Credit Facility [Member] | Revolving Loans [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations $ 344,300 456,900
Credit Facility [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations 366,900 376,900
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