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Recent Developments	12 Months Ended
Recent Developments	Dec. 31, 2017
Subsequent Events [Abstract]
Recent Developments	Recent Developments On February 7, 2018, the Company acquired 100 percent of the outstanding stock of Great Lakes Educational Loan Services, Inc. (“Great Lakes”) for a purchase price of $150.0 million in cash. The Company and Great Lakes are two of the four large private sector companies, or TIVAS, that have student loan servicing contracts with the Department of Education to provide servicing for loans owned by the Department. The operating results of Great Lakes will be included in the Company's Loan Systems and Servicing operating segment beginning February 7, 2018.