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Acquisitions and Dispositions of Businesses (Significant Component) (Details 3) - Kaplan University Transaction [Member] - Education [Member] - Higher Education [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Disposal Group, Not Discontinued Operation, Revenue $ 91,526 $ 110,874
Disposal Group, Not Discontinued Operation, Operating Income $ 213 $ 4,009