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Debt (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Amount outstanding $ 218,014,000 $ 277,839,000
Credit Agreement | Term loan    
Line of Credit Facility [Line Items]    
Borrowing capacity $ 365,000,000.0  
Term of debt 7 years  
Principal loan payments $ 62,500,000  
Debt retired 10,000,000.0  
Amount paid for debt 8,900,000  
Amount outstanding 223,200,000  
Debt issuance costs (5,200,000)  
Credit Agreement | Revolving credit facility    
Line of Credit Facility [Line Items]    
Borrowing capacity $ 100,000,000.0  
Term of debt 5 years  
Amount outstanding $ 0