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Acquisitions and Dispositions of Businesses (Dispositions and Other) (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 22, 2018
USD ($)
Mar. 31, 2018
USD ($)
business
Mar. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Advance Related To Kaplan University Transaction   $ 20,000 $ 0
Gain on sale of business   $ 5,907 $ (342)
Graham Healthcare Group [Member] | Celtic Healthcare Allegheny Health Network Joint Venture [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Ownership percentage of joint venture   40.00%  
Education [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of business   $ 5,907  
Number of businesses disposed | business   2  
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
First Five Years of Transition and Operations Support Agreement 5 years    
Transition and Operations Support Agreement Initial Term 30 years    
Transition and Operations Support Agreement Renewal Periods 5 years    
Transition and Operations Support Agreement Buy-Out Option Eligible Year 6 years    
Number of Consecutive Years of Purdue University Global Cash Operating Losses 3 years    
Gain on sale of business   $ 4,300  
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | Minimum [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Annual Purdue University Global Cash Operating Losses $ 25,000    
Aggregate Purdue University Global cash operating losses $ 75,000    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | Purdue University Global [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Percentage of Cost Efficiencies 20.00%    
Advance Related To Kaplan University Transaction $ 20,000    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | Kaplan [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Percentage of Cost Efficiencies 20.00%    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | March 22, 2018 through June 30, 2022 [Member] | Kaplan [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Kaplan Share of Purdue University Global Revenue 12.50%    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | March 22, 2018 through June 30, 2023 [Member] | Purdue University Global [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Amount of Priority Payment Per Year Beyond Costs $ 10,000    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | July 1, 2022 through June 30, 2027 [Member] | Kaplan [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Kaplan Share of Purdue University Global Revenue 13.00%    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | After June 30, 2023 [Member] | Purdue University Global [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Percentage of Revenue After Kaplan Efficiency Payment 10.00%    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | After June 30, 2024 [Member] | Kaplan [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Kaplan University Transaction Termination Fee 125.00%    
Purdue University Global Final Payment Note Duration 10 years    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | After June 30, 2027 [Member] | Kaplan [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Kaplan Share of Purdue University Global Revenue 12.50%    
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member] | After June 30, 2048 [Member] | Kaplan [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Kaplan University Transaction Termination Fee 75.00%    
Purdue University Global Final Payment Note Duration 10 years