Annual report pursuant to Section 13 and 15(d)

Debt (Amended Credit Agreement) (Details)

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Debt (Amended Credit Agreement) (Details) - USD ($)
12 Months Ended
Nov. 19, 2015
Dec. 31, 2021
Oct. 31, 2021
Dec. 31, 2020
Revolving credit facility | Line of Credit        
Line of Credit Facility [Line Items]        
Current borrowing capacity   $ 500,000,000    
Second Amended and Restated Credit Agreement        
Line of Credit Facility [Line Items]        
Credit facility amount     $ 500,000,000  
Right to increase credit facility, amount     150,000,000  
Credit facility outstanding   $ 0   $ 0
Letters of credit        
Line of Credit Facility [Line Items]        
Credit facility amount     $ 5,000,000  
Credit Agreement        
Line of Credit Facility [Line Items]        
Voting equity of foreign subsidiary pledged (as a percent) 66.00%      
Non-voting equity of foreign subsidiary pledged (as a percent) 100.00%      
Commitment fee (as a percent)   0.25%    
Credit Agreement | Prepaid Expenses        
Line of Credit Facility [Line Items]        
Debt issuance cost, outstanding   $ 900,000    
Credit Agreement | Other non-current assets        
Line of Credit Facility [Line Items]        
Debt issuance cost, outstanding   $ 1,500,000    
Credit Agreement | LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Spread on variable rate basis (as a percent) 1.50%      
Credit Agreement | LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Spread on variable rate basis (as a percent) 3.25%