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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 |  |  |  |  |  |  |

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