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Debt (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 25, 2016
GBP (£)
Jul. 14, 2016
GBP (£)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]              
Average borrowings outstanding     $ 492,400 $ 473,700 $ 493,500 $ 429,400  
Weighted average interest rate of borrowings     6.30% 6.20% 6.30% 6.90%  
Net interest expense incurred     $ 7,800 $ 7,900 $ 22,400 $ 22,500  
7.25% Unsecured Notes due February 1, 2019 [Member]              
Debt Instrument [Line Items]              
Unamortized debt issuance costs     $ 100   $ 100   $ 100
Interest rate     7.25%   7.25%   7.25%
Fair value of debt instrument     $ 424,100   $ 424,100   $ 438,700
Carrying value of debt instrument [1]     $ 399,393   $ 399,393   399,052
Other Indebtedness [Member]              
Debt Instrument [Line Items]              
Interest rate     2.00%   2.00%    
Maturity year         Dec. 31, 2025    
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]              
Debt Instrument [Line Items]              
Unamortized debt issuance costs     $ 400   $ 400   500
Borrowings outstanding [2]     $ 93,450   $ 93,450   $ 91,316
Education [Member] | Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Applicable interest rate margin 1.50%            
Notional amount of derivative | £ £ 75,000,000            
Fixed interest rate of derivative 0.51%            
Total fixed interest rate 2.01%            
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]              
Debt Instrument [Line Items]              
Credit facility current borrowing capacity | £   £ 75,000,000          
Borrowings outstanding | £ £ 75,000,000            
Term of debt instrument   4 years          
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | Debt Instrument, Redemption, first anniversary [Member]              
Debt Instrument [Line Items]              
Percentage of loan to be repaid   6.66%          
Debt covenant leverage ratio, maximum   3.5          
Debt covenant interest coverage ratio, minimum   3.5          
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | Debt Instrument, Redemption, second anniversary [Member]              
Debt Instrument [Line Items]              
Percentage of loan to be repaid   6.66%          
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | Debt Instrument, Redemption, third anniversary [Member]              
Debt Instrument [Line Items]              
Percentage of loan to be repaid   6.66%          
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Applicable interest rate margin   1.25%          
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Applicable interest rate margin   1.75%          
[1] The carrying value is net of $0.1 million of unamortized debt issuance costs as of September 30, 2017 and December 31, 2016, respectively.
[2] The carrying value is net of $0.4 million and $0.5 million of unamortized debt issuance costs as of September 30, 2017 and December 31, 2016, respectively.