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Discontinued Operations (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 01, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jan. 31, 2015
USD ($)
school
Dec. 31, 2015
USD ($)
employee
shares
Jun. 30, 2015
USD ($)
employee
shares
Sep. 30, 2014
USD ($)
school
Jun. 30, 2014
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of shares forfeited due to modification | shares               4,175    
Net assets divested $ 406,500,000                  
Net assets divested, net of cash 312,300,000                  
Pre-tax gain (loss) on sale and/or disposition                 $ 732,000 $ (351,133,000)
Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
GHC dividend received from Cable ONE   $ 450,000,000                
Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Cable ONE, unsecured notes   450,000,000     $ 450,000,000          
Cable Spin-Off [Member] | Cable [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Cable ONE, unsecured notes   $ 550,000,000     $ 550,000,000          
Berkshire Exchange Transaction [Member] | WPLG [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
After-tax gain (loss) on sale and/or disposition             $ 375,000,000      
Pension Plan [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Curtailment gain               $ 0 3,267,000 0
Pension Plan [Member] | Discontinued Operations [Member] | Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Curtailment gain                 2,200,000  
July 2015 through December 2018 [Member] | Restricted Stock [Member] | Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Incremental stock compensation from modification 3,000,000                  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Net assets divested 406,453,000                  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Discontinued Operations [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Spin-off Costs                 $ 7,400,000 $ 3,500,000
Kaplan International [Member] | Kaplan China [Member] | Education [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of schools sold | school     1     3        
Pre-tax gain (loss) on sale and/or disposition     $ 700,000     $ 3,100,000        
Common Class B [Member] | Employee Stock Option [Member] | Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Incremental stock compensation from modification 23,500,000                  
Common Class B [Member] | Restricted Stock [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of shares modified | shares       9,800            
Number of employees affected by modification | employee       1            
Number of share awards with accelerated vesting | shares       9,412            
Number of shares forfeited due to modification | shares       388            
Common Class B [Member] | Restricted Stock [Member] | Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of shares modified | shares         10,830          
Number of share awards with accelerated vesting | shares         6,324          
Number of shares forfeited due to modification | shares         4,506          
Common Class B [Member] | Restricted Stock [Member] | Cable Spin-Off [Member] | Cable [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of employees affected by modification | employee         21          
Common Class B [Member] | Restricted Stock [Member] | Discontinued Operations [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Incremental stock compensation from modification       $ 6,000,000            
Common Class B [Member] | Restricted Stock [Member] | Discontinued Operations [Member] | Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Incremental stock compensation from modification         $ 3,700,000          
Common Class B [Member] | Q3 2015 [Member] | Employee Stock Option [Member] | Cable Spin-Off [Member] | Corporate Office [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Incremental stock compensation from modification 18,800,000                  
Common Class B [Member] | July 2015 through December 2018 [Member] | Employee Stock Option [Member] | Cable Spin-Off [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Incremental stock compensation from modification $ 4,700,000