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Debt - Outstanding (Details) - Senior Credit Facility - Bank of America, Wells Fargo Bank, and Other Lenders - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Total Debt $ 35,000 $ 58,705
Term facility    
Line of Credit Facility [Line Items]    
Total Debt 0 58,705
Revolving facility    
Line of Credit Facility [Line Items]    
Total Debt $ 35,000 $ 0