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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 25, 2016
GBP (£)
Jul. 14, 2016
GBP (£)
Jun. 29, 2015
USD ($)
Jan. 31, 2009
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Debt Instrument [Line Items]                                
Average borrowings outstanding                         $ 493,200,000 $ 443,900,000    
Weighted average interest rate of borrowings                         6.30% 6.70%    
Net interest expense incurred                         $ 27,300,000 $ 32,300,000 $ 30,700,000  
Interest Income         $ 3,184,000 $ 861,000 $ 1,173,000 $ 1,363,000 $ 1,041,000 $ 740,000 $ 721,000 $ 591,000 6,581,000 3,093,000 1,909,000  
Interest expense         $ 8,103,000 $ 8,619,000 $ 9,035,000 $ 8,129,000 10,857,000 $ 8,614,000 $ 7,971,000 $ 7,948,000 $ 33,886,000 35,390,000 $ 32,654,000  
7.25% Unsecured Notes due February 1, 2019 [Member]                                
Debt Instrument [Line Items]                                
Unamortized Debt Issuance Expense                 $ 100,000         $ 100,000    
Interest rate of debt instrument       7.25% 7.25%       7.25%       7.25% 7.25%    
Face amount of debt issued       $ 400,000,000                        
Debt Instrument, Maturity date       Feb. 01, 2019                        
Notes repurchase percentage of principal amount to be eligible for redemption       101.00%                        
Fair value of debt instrument         $ 414,700,000       $ 438,700,000       $ 414,700,000 $ 438,700,000    
Carrying value of debt instrument [1]         399,507,000       399,052,000       399,507,000 399,052,000    
Debt Instrument, Term       10 years                        
Five-Year Revolving Credit Agreement Dated June 29, 2015 [Member]                                
Debt Instrument [Line Items]                                
Covenant, Leverage Ratio, Maximum     3.5                          
Covenant, Interest Coverage Ratio, Minimum     3.5                          
Line of Credit         $ 0       0       $ 0 $ 0    
Current borrowing capacity     $ 200,000,000                          
Debt Instrument, Term     5 years                          
Other Indebtedness [Member]                                
Debt Instrument [Line Items]                                
Interest rate of debt instrument         2.00%               2.00%      
Debt Instrument, Maturity year, start                           Jan. 01, 2019    
Debt Instrument, Maturity year, end                           Dec. 31, 2026    
Debt Instrument, Maturity date                         Dec. 31, 2026      
Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]                                
Debt Instrument [Line Items]                                
Unamortized Debt Issuance Expense         $ 400,000       500,000       $ 400,000 $ 500,000    
Line of Credit [2]         $ 93,671,000       $ 91,316,000       93,671,000 $ 91,316,000    
Minimum [Member] | Five-Year Revolving Credit Agreement Dated June 29, 2015 [Member]                                
Debt Instrument [Line Items]                                
Unused Capacity, Commitment Fee Percentage     0.15%                          
Minimum [Member] | Other Indebtedness [Member]                                
Debt Instrument [Line Items]                                
Interest rate of debt instrument                 2.00%         2.00%    
Maximum [Member] | Five-Year Revolving Credit Agreement Dated June 29, 2015 [Member]                                
Debt Instrument [Line Items]                                
Unused Capacity, Commitment Fee Percentage     0.25%                          
Maximum [Member] | Other Indebtedness [Member]                                
Debt Instrument [Line Items]                                
Interest rate of debt instrument                 6.00%         6.00%    
Eurodollar [Member] | Five-Year Revolving Credit Agreement Dated June 29, 2015 [Member]                                
Debt Instrument [Line Items]                                
Basis Spread on Variable Rate     1.00%                          
Federal Funds Effective Swap Rate [Member] | Five-Year Revolving Credit Agreement Dated June 29, 2015 [Member]                                
Debt Instrument [Line Items]                                
Basis Spread on Variable Rate     0.50%                          
Education [Member] | Interest Rate Swap [Member]                                
Debt Instrument [Line Items]                                
Notional amount of cash flow hedge | £ £ 75,000,000                              
Derivative, Fixed Interest Rate 0.51%                              
Interest rate swap percentage rate 2.01%                              
Basis Spread on Variable Rate 1.50%                              
Education [Member] | Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]                                
Debt Instrument [Line Items]                                
Covenant, Leverage Ratio, Maximum   3.5                            
Covenant, Interest Coverage Ratio, Minimum   3.5                            
Line of Credit | £ £ 75,000,000                              
Current borrowing capacity | £   £ 75,000,000                            
Debt Instrument, Term   4 years                            
Education [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]                                
Debt Instrument [Line Items]                                
Basis Spread on Variable Rate   1.25%                            
Education [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]                                
Debt Instrument [Line Items]                                
Basis Spread on Variable Rate   1.75%                            
Cable Spin-Off [Member]                                
Debt Instrument [Line Items]                                
Face amount of debt issued                               $ 450,000,000
Cable Spin-Off [Member] | Cable [Member]                                
Debt Instrument [Line Items]                                
Face amount of debt issued                               $ 550,000,000
Debt Instrument, Redemption, First Anniversary [Member] | Education [Member] | Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument Price Percentage Of Outstanding Balance Redeemed   6.66%                            
Debt Instrument, Redemption, Second Anniversary [Member] | Education [Member] | Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument Price Percentage Of Outstanding Balance Redeemed   6.66%                            
Debt Instrument, Redemption, Third Anniversary [Member] | Education [Member] | Kaplan Four Year Credit Agreement Dated July 14, 2016 [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument Price Percentage Of Outstanding Balance Redeemed   6.66%                            
Securities Subject to Mandatory Redemption [Member]                                
Debt Instrument [Line Items]                                
Interest Income                         $ 2,300,000      
Interest expense                           $ 2,700,000    
[1] The carrying value is net of $0.1 million of unamortized debt issuance costs as of December 31, 2016.
[2] The carrying value is net of $0.4 million and $0.5 million of unamortized debt issuance costs as of December 31, 2017 and 2016, respectively.