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Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
business
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
business
Aug. 31, 2018
Jul. 31, 2018
Jul. 12, 2018
May 31, 2018
Jun. 30, 2017
Feb. 28, 2017
Business Acquisition [Line Items]                      
Number of businesses acquired | business     8   6            
Acqusition purchase price     $ 120,900   $ 318,900            
Pension and other post retirement benefits liabilities         (59,100)            
Purchase Price Net of Cash     111,451 $ 299,938              
Business Acquisition, Transaction Costs   $ 1,200 1,200 $ 4,100              
Goodwill expected to be deductible for income tax purposes   32,400 32,400   $ 11,000            
Revenues of acquired companies since acquisition date   10,200 12,600                
Operating loss of acquired companies since acquisition date   $ 0 $ (800)                
Education [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business     5   2            
Education [Member] | Professional (U.S.) [Member] | College for Financial Planning [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired               100.00%      
Education [Member] | Professional (U.S.) [Member] | Professional Publications, Inc. [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired                 100.00%    
Education [Member] | Kaplan International [Member] | Genesis [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired                     100.00%
Education [Member] | Kaplan International [Member] | Red Marker [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired                     100.00%
Television Broadcasting [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business         2            
Other Businesses [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business     2   1            
Other Businesses [Member] | Hoover Treated Wood Products [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired 97.72%                    
Purchase Price Net of Cash $ 206,800                    
Redeemable noncontrolling interest $ 3,700                    
Other Businesses [Member] | Furnlite Inc [Member] | Dekko [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired             100.00%        
Other Businesses [Member] | Marketplace Strategy [Member] | SocialCode [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired           100.00%          
Graham Healthcare Group [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business     1   1            
Graham Healthcare Group [Member] | Hometown Home Health and Hospice [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired                   100.00%