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Debt - Schedule of Carrying Values of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Finance lease and other obligations $ 305,800 $ 288,500
Total debt obligations 1,521,700 1,318,700
Less unamortized deferred financing costs (13,600) (16,000)
Total debt, net of deferred financing costs 1,508,100 1,302,700
Current portion of long-term debt 161,016 145,110
Long-term debt 1,347,149 1,157,632
Credit Facility | Revolving Loans    
Debt Instrument [Line Items]    
Long-term debt obligations 225,900 32,700
Credit Facility | Term Loan    
Debt Instrument [Line Items]    
Long-term debt obligations 390,000 397,500
Senior Notes | 4.50% Senior Notes    
Debt Instrument [Line Items]    
Long-term debt obligations $ 600,000 $ 600,000
Debt instrument, interest rate (percentage) 4.50% 4.50%