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Debt and Financing Obligations - Credit Facility (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
Sep. 30, 2022
USD ($)
item
Sep. 30, 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   $ 1,550,000         $ 1,350,000
Working capital revolving credit facility-current portion               204,700
Working capital revolving credit facility-less current portion               150,000
Revolving credit facility 99,000   99,000         43,400
Total borrowings outstanding 99,000   99,000         398,100
Less outstanding letters of credit 205,200   205,200         156,000
Total remaining availability for borrowings and letters of credit 1,245,800   1,245,800         $ 795,900
Credit Agreement                
Debt and Financing Obligations                
Total available commitments 1,550,000   $ 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   $ 1,850,000   $ 300,000      
Average interest rates (as a percent) 4.10% 2.30% 3.10% 2.50%        
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   $ 1,100,000          
Long-term portion 0   $ 0          
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   $ 75,000          
Non Working Capital Facility                
Debt and Financing Obligations                
Total available commitments 450,000   $ 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   $ 300,000          
Accordion, minimum draw     $ 25,000