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Major Customer (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Concentration Risk [Line Items]    
Concentration Risk, Customer Department of Education Department of Education
Concentration Risk Dollar Value [Member]    
Concentration Risk [Line Items]    
Loan and guaranty servicing revenue $ 35.2 $ 32.4