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Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Goodwill) (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
business
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Goodwill [Line Items]                        
Asset Impairment Charges $ 0 $ 8,109 $ 0 $ 0 $ 78 $ 312 $ 9,224 $ 0   $ 8,109 $ 9,614 $ 1,603
Goodwill, Impairment Loss                     7,616  
Education [Member]                        
Goodwill [Line Items]                        
Goodwill, Impairment Loss                     0  
Other Businesses [Member]                        
Goodwill [Line Items]                        
Number of businesses recorded impairment of goodwill | business                 1      
Goodwill, Impairment Loss                 $ 1,600   $ 7,616  
Forney [Member] | Other Businesses [Member]                        
Goodwill [Line Items]                        
Asset Impairment Charges             $ 8,600