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Borrowings - Amended and Restated Credit Agreement (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Jan. 29, 2019
Dec. 31, 2018
Revolving loan facility      
Borrowings      
Maximum borrowing capacity   $ 20,000,000.0  
Outstanding amounts $ 0   $ 0
Term Loan      
Borrowings      
Maximum borrowing capacity   $ 60,000,000.0  
Outstanding amounts 55,500,000    
Short-term outstanding balance for the period ending 6,000,000.0    
Long-term outstanding balance for the period ending $ 49,500,000    
Interest rate (as a percent)   1.50%