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Debt (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Amount outstanding $ 291,995,000 $ 329,184,000
Credit Agreement | Term loan    
Line of Credit Facility [Line Items]    
Borrowing capacity $ 365,000,000.0  
Term of debt 7 years  
Principal loan payments $ 39,800,000  
Amount outstanding 300,700,000  
Debt issuance costs 8,700,000  
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