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Borrowing Facilities - Long-term debt outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Less unamortized debt issuance costs $ (1,502) $ (1,616)
Long-term debt 235,998 142,759
Revolving credit facility, due 2023 [Member]    
Line of Credit Facility [Line Items]    
Principal amount 95,000 0
Term loan, due 2023 [Member]    
Line of Credit Facility [Line Items]    
Principal amount $ 142,500 $ 144,375