Annual report pursuant to Section 13 and 15(d)

Debt - Revolving Credit Facility (Details)

v3.22.0.1
Debt - Revolving Credit Facility (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Jan. 22, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]          
Repayments of line of credit     $ 253,000,000 $ 654,902,000 $ 323,000,000
Revolving Credit Facility | Line of Credit          
Line of Credit Facility [Line Items]          
Borrowing capacity, maturity extended   $ 325,200,000      
Available capacity $ 475,000,000   475,000,000    
Revolving Credit Facility | Line of Credit | Prior Revolving Credit Facility, retired January 2021          
Line of Credit Facility [Line Items]          
Borrowing capacity       357,900,000  
Outstanding balance   109,000,000   $ 94,000,000  
Borrowing capacity, maturity extended   325,200,000      
Borrowing capacity, maturity not extended   32,700,000      
Repayments of line of credit   $ 109,000,000      
Revolving Credit Facility | Line of Credit | Amended Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Borrowing capacity 341,500,000   341,500,000    
Outstanding balance 0   0    
Debt covenant, minimum liquidity requirement $ 100,000,000   $ 100,000,000    
Weighted average interest rate at end of period 3.85%   3.85%    
Weighted average amount outstanding     $ 9,300,000    
Highest month-end balance     40,000,000    
Revolving Credit Facility | Line of Credit | Amended Revolving Credit Facility | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable interest rate 4.25%        
Revolving Credit Facility | Line of Credit | Amended Revolving Credit Facility | Base rate          
Line of Credit Facility [Line Items]          
Basis spread on variable interest rate 3.25%        
Revolving Credit Facility | Line of Credit | Minimum | Amended Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Interest repayment term 30 days        
Revolving Credit Facility | Line of Credit | Maximum | Amended Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Interest repayment term 180 days        
Letter of Credit | Line of Credit | Amended Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Outstanding balance $ 33,500,000   $ 33,500,000