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Long-term Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Current portion long-term debt $ 360,843 $ 406,005
Current portion of unamortized debt issue cost, net (3,380) (3,847)
Current portion of long-term debt, net of debt issue costs 357,463 402,158
Long-term debt, net of current maturities 2,779,931 2,829,997
Long-term portion of unamortized debt issue cost, net (31,214) (28,459)
Long-term debt, net of current maturities and debt issue costs 2,748,717 2,801,538
Total long-term debt (including current portion) 3,140,774 3,236,002
Total unamortized debt issue cost, net (34,594) (32,306)
Total long-term debt, net of debt issue costs 3,106,180 3,203,696
Long-term debt 3,106,180 3,203,696
Amount outstanding 0  
Maximum borrowing capacity 75,000  
Current borrowing capacity 41,000  
Letters of credit and surety bonds    
Debt Instrument [Line Items]    
Amount outstanding 59,500 $ 61,100
Letters of credit    
Debt Instrument [Line Items]    
Amount outstanding 34,000  
Promissory note    
Debt Instrument [Line Items]    
Total long-term debt, net of debt issue costs 39,900  
Principal amount $ 39,900  
Warrants to purchase shares 98,815  
Long-term debt $ 39,900  
Common stock value issued $ 3,300  
Warrants exercise price $ 40.41  
Warrant term 5 years  
Secured loan    
Debt Instrument [Line Items]    
Total long-term debt (including current portion) $ 60,000