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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 19, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Finance lease and other obligations $ 282,600   $ 183,200
Total long-term debt obligations 1,333,700   1,417,000
Less unamortized deferred financing costs (13,100)   (10,100)
Total debt, net of deferred financing costs 1,320,600   1,406,900
Current portion of long-term debt 99,513   82,655
Long-term debt $ 1,221,127   1,324,223
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 $ 251,100   456,900
Credit Facility [Member] | Term Loan [Member]      
Debt Instrument [Line Items]      
Long-term debt obligations 400,000 $ 400,000 376,900
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