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Long-term Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 10, 2021
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Current portion long-term debt   $ 364,429 $ 364,429 $ 406,005
Current portion of unamortized debt issue cost, net   (3,461) (3,461) (3,847)
Current portion of long-term debt, net of debt issue costs   360,968 360,968 402,158
Long-term debt, net of current maturities   2,681,204 2,681,204 2,829,997
Long-term portion of unamortized debt issue cost, net   (28,942) (28,942) (28,459)
Long-term debt, net of current maturities and debt issue costs   2,652,262 2,652,262 2,801,538
Total long-term debt (including current portion)   3,045,633 3,045,633 3,236,002
Total unamortized debt issue cost, net   (32,403) (32,403) (32,306)
Total long-term debt, net of debt issue costs   $ 3,013,230 $ 3,013,230 3,203,696
Warrants to purchase shares   78,000 78,000  
Long-term debt   $ 3,013,230 $ 3,013,230 3,203,696
Warrants exercise price   $ 57.47 $ 57.47  
Amount outstanding   $ 0 $ 0  
Maximum borrowing capacity   75,000 75,000  
Current borrowing capacity   41,000 41,000  
Repayments of secured debt $ 61,200 61,200    
Letters of credit and surety bonds        
Debt Instrument [Line Items]        
Amount outstanding   59,500 59,500 $ 61,100
Letters of credit        
Debt Instrument [Line Items]        
Amount outstanding   34,000 34,000  
Promissory note        
Debt Instrument [Line Items]        
Total long-term debt, net of debt issue costs   95,400 95,400  
Principal amount   95,400 95,400  
Long-term debt   95,400 95,400  
Common stock value issued   $ 5,800 $ 5,800  
Maximum | Promissory note        
Debt Instrument [Line Items]        
Warrants to purchase shares   203,090 203,090  
PSP Extension Agreement        
Debt Instrument [Line Items]        
Principal amount   $ 268,100 $ 268,100  
PSP 3 Agreement        
Debt Instrument [Line Items]        
Principal amount   $ 250,000 $ 250,000  
Warrant Shares | PSP Extension Agreement        
Debt Instrument [Line Items]        
Warrants to purchase shares   124,773 124,773  
Warrants exercise price   $ 40.41 $ 40.41  
Warrant term     5 years  
Warrant Shares | PSP Extension Agreement | Maximum        
Debt Instrument [Line Items]        
Warrants to purchase shares   124,773 124,773  
Warrant Shares | PSP 3 Agreement        
Debt Instrument [Line Items]        
Warrants to purchase shares   78,317 78,317  
Warrants exercise price   $ 57.47 $ 57.47  
Warrant term     5 years  
Warrant Shares | PSP 3 Agreement | Maximum        
Debt Instrument [Line Items]        
Warrants to purchase shares   78,317 78,317