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Debt (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Jun. 05, 2017
Jun. 04, 2017
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 375,000,000 $ 200,000,000
Borrowings under term loan       $ 178,500,000
Credit Agreement accordion feature     200,000,000  
Credit Agreement outstanding borrowings $ 135,000,000 $ 170,000,000 0  
Credit Agreement, interest rate at period end 3.474% 2.486%    
Credit Agreement, commitment fee percentage 0.125%      
Credit Agreement, current borrowing capacity $ 240,000,000      
Swing Line        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 25,000,000