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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Capital lease obligations $ 187,500 $ 181,200
Total long-term debt obligations 1,442,400 1,381,600
Less unamortized deferred financing costs (12,300) (13,000)
Total debt, net of deferred financing costs 1,430,100 1,368,600
Current portion of long-term debt 86,558 87,866
Long-term debt $ 1,343,549 1,280,706
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 $ 453,800 377,700
Credit Facility [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations 391,900 396,900
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  
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Debt instrument, weighted average interest rate (percentage) 3.70%  
Capital lease obligations, expiration date, range, end Sep. 01, 2022  
Other Debt Obligations [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations $ 9,200 $ 25,800