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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Finance lease and other obligations $ 205,900 $ 183,200
Total long-term debt obligations 1,638,200 1,417,000
Less unamortized deferred financing costs (9,400) (10,100)
Total debt, net of deferred financing costs 1,628,800 1,406,900
Current portion of long-term debt 89,481 82,655
Long-term debt $ 1,539,294 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 $ 660,400 456,900
Credit Facility [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations 371,900 376,900
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