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Acquisitions and Dispositions of Businesses (Dispositions and Other) (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Change in redemption value of redeemable noncontrolling interest   $ 64 $ 65 $ 761      
Purchase of redeemable noncontrolling interest       $ 0      
Education [Member] | Higher Education [Member] | Kaplan University Transaction [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain related to contingent consideration   $ 1,300     $ 800 $ 2,800 $ 2,500
Hoover Treated Wood Products [Member] | Manufacturing [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Purchase of redeemable noncontrolling interest $ 3,500            
Ownership percentage by parent   100.00%       100.00%