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Financing Arrangements - Equipment Notes (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2020
financing_agreement
Debt Instrument [Line Items]        
Number of long-term financing agreements | financing_agreement       4
Long-term debt $ 1,192,422   $ 665,163  
Long-term debt, excluding current maturities 1,174,990   650,564  
2020 Equipment Note | Secured Debt        
Debt Instrument [Line Items]        
Long-term debt 29,747   31,822  
Long-term debt, current maturities 8,797   8,761  
Long-term debt, excluding current maturities 20,950   $ 23,061  
Interest expense, debt $ 239 $ 165    
2020 Equipment Note | Secured Debt | Minimum        
Debt Instrument [Line Items]        
Line of credit facility, interest rate at period end 2.36%      
2020 Equipment Note | Secured Debt | Maximum        
Debt Instrument [Line Items]        
Line of credit facility, interest rate at period end 3.79%