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Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
business
Jul. 31, 2019
business
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
business
Aug. 31, 2018
Jul. 31, 2018
Jul. 12, 2018
May 31, 2018
Business Acquisition [Line Items]                  
Document Fiscal Year Focus     2019            
Number of businesses acquired | business         8        
Acqusition purchase price | $         $ 121,100        
Purchase Price Net of Cash | $     $ 84,071 $ 24,717          
Business Acquisition, Transaction Costs | $       $ 600          
Goodwill expected to be deductible for income tax purposes | $         $ 32,300        
Education [Member]                  
Business Acquisition [Line Items]                  
Number of businesses acquired | business         5        
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%
Other Businesses [Member]                  
Business Acquisition [Line Items]                  
Number of businesses acquired | business         2        
Other Businesses [Member] | Furnlite Inc [Member] | Dekko [Member]                  
Business Acquisition [Line Items]                  
Percentage of interest acquired             100.00%    
Other Businesses [Member] | Auto dealerships [Member]                  
Business Acquisition [Line Items]                  
Percentage of interest acquired 90.00%                
Advances to Affiliate | $ $ 3,500                
Interest Rate on Advance to Minority Shareholder 6.00%                
Number of businesses acquired | business 2                
Amount Borrowed to Finance Business Acquisition | $ $ 30,000                
Derivative, Fixed Interest Rate 4.70%                
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        
Subsequent Event [Member] | Other Businesses [Member] | Clyde's Restaurant Group [Member]                  
Business Acquisition [Line Items]                  
Number of Restaurants   13              
Subsequent Event [Member] | Graham Healthcare Group [Member]                  
Business Acquisition [Line Items]                  
Number of businesses acquired | business   1