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Debt and Financing Obligations - Credit Facility (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
item
Mar. 31, 2021
Mar. 30, 2022
USD ($)
Mar. 09, 2022
USD ($)
Mar. 08, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt and Financing Obligations            
Total available commitments $ 1,550,000         $ 1,350,000
Working capital revolving credit facility - current portion 178,600         204,700
Working capital revolving credit facility-less current portion 200,000         150,000
Revolving credit facility 228,000         43,400
Total borrowings outstanding 606,600         398,100
Less outstanding letters of credit 209,000         156,000
Total remaining availability for borrowings and letters of credit 734,400         $ 795,900
Credit Agreement            
Debt and Financing Obligations            
Total available commitments $ 1,550,000     $ 1,550,000 $ 1,350,000  
Number of line of credit facilities | item 2          
Total available commitments including accordion $ 1,850,000   $ 300,000      
Average interest rates (as a percent) 2.30% 2.70%        
Working capital interim commitments     0 $ 200,000    
Working capital revolving credit facility     $ 200,000      
Working Capital Facility            
Debt and Financing Obligations            
Total available commitments $ 1,100,000          
Long-term portion $ 200,000          
Working Capital Facility | Base rate | Maximum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 1.50%          
Working Capital Facility | Base rate | Minimum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 1.00%          
Working Capital Facility | SOFR            
Debt and Financing Obligations            
Interest rate margin (as a percent) 0.10%          
Working Capital Facility | SOFR | Maximum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 2.50%          
Working Capital Facility | SOFR | Minimum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 2.00%          
Credit Facility Swingline Feature            
Debt and Financing Obligations            
Total available commitments $ 75,000          
Non Working Capital Facility            
Debt and Financing Obligations            
Total available commitments $ 450,000          
Non Working Capital Facility | Base rate | Maximum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 1.75%          
Non Working Capital Facility | Base rate | Minimum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 0.75%          
Non Working Capital Facility | SOFR            
Debt and Financing Obligations            
Interest rate margin (as a percent) 0.10%          
Non Working Capital Facility | SOFR | Maximum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 2.75%          
Non Working Capital Facility | SOFR | Minimum            
Debt and Financing Obligations            
Interest rate margin (as a percent) 1.75%          
Credit Facility Accordion Feature            
Debt and Financing Obligations            
Total available commitments $ 300,000          
Accordion, minimum draw $ 25,000