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Major Customer (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Great Lakes Educational Loan Service      
Concentration Risk [Line Items]      
Acquiree revenue since acquisition $ 30,800 $ 47,100  
Government servicing - Nelnet      
Concentration Risk [Line Items]      
Revenue   39,640 $ 39,327
Government servicing - Nelnet | Concentration Risk Dollar Value      
Concentration Risk [Line Items]      
Revenue   $ 39,600 $ 39,300