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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Capital lease obligations $ 177,900 $ 98,600
Total long-term debt obligations 1,403,700 1,035,800
Less unamortized deferred financing costs (14,400) (9,800)
Total debt, net of deferred financing costs 1,389,300 1,026,000
Current portion of long-term debt 75,401 64,600
Long-term debt $ 1,313,860 961,379
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 $ 564,600 279,900
Credit Facility [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations $ 250,000 237,500
Senior Notes [Member] | 4.875% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt instrument, maturity date Mar. 15, 2023  
Long-term debt obligations $ 400,000 400,000
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Capital lease obligations, expiration date, range, end Jun. 30, 2022  
Notes Payable and Other Debt Obligations [Member]    
Debt Instrument [Line Items]    
Long-term debt obligations $ 11,200 $ 19,800