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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Capital lease obligations $ 181,200 $ 98,600
Total long-term debt obligations 1,381,600 1,035,800
Less unamortized deferred financing costs (13,000) (9,800)
Total debt, net of deferred financing costs 1,368,600 1,026,000
Current portion of long-term debt 87,866 64,600
Long-term debt $ 1,280,706 961,379
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 $ 377,700 279,900
Credit Facility [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations 396,900 237,500
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) 3.50%  
Capital lease obligations, expiration date, range, end Sep. 01, 2022  
Other Debt Obligations [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations $ 25,800 $ 19,800