Quarterly report pursuant to Section 13 or 15(d)

Debt - Revolving Credit Facility (Details)

v3.21.2
Debt - Revolving Credit Facility (Details) - USD ($)
 9 Months Ended
Jan. 22, 2021
Sep. 30, 2021
Sep. 30, 2020
Jan. 21, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]          
Outstanding balance   $ 2,399,158,000      
Repayments of Long-term Lines of Credit   228,000,000 $ 587,902,000    
Revolving Credit Facility | Line of Credit          
Line of Credit Facility [Line Items]          
Borrowing capacity       $ 357,900,000  
Outstanding balance $ 109,000,000 0     $ 94,000,000
Borrowing capacity, maturity extended 325,200,000        
Borrowing capacity, maturity not extended 32,700,000        
Repayments of Long-term Lines of Credit $ 109,000,000        
Debt covenant, minimum liquidity requirement   100,000,000      
Available capacity   $ 217,800,000      
Weighted average interest rate   3.83%      
Weighted average amount outstanding   $ 12,100,000      
Highest month-end balance   40,000,000      
Revolving Credit Facility | Line of Credit | Interest Rate Scenario One          
Line of Credit Facility [Line Items]          
Available capacity   $ 185,100,000      
Revolving Credit Facility | Line of Credit | Interest Rate Scenario One | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable interest rate   4.25%      
Revolving Credit Facility | Line of Credit | Interest Rate Scenario One | Base rate          
Line of Credit Facility [Line Items]          
Basis spread on variable interest rate   3.25%      
Revolving Credit Facility | Line of Credit | Interest Rate Scenario Two          
Line of Credit Facility [Line Items]          
Available capacity   $ 32,700,000      
Revolving Credit Facility | Line of Credit | Interest Rate Scenario Two | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable interest rate   3.00%      
Revolving Credit Facility | Line of Credit | Interest Rate Scenario Two | Base rate          
Line of Credit Facility [Line Items]          
Basis spread on variable interest rate   2.00%      
Letter of Credit | Line of Credit          
Line of Credit Facility [Line Items]          
Outstanding balance   $ 40,100,000