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Divestiture (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Consideration received for sale of business $ 10,636  
Impairment of long-lived assets to be disposed of 3,021  
Net loss (gain) and impairment on divestiture of businesses   $ 2,528
Notes receivable, current 2,853 7,213
Disposal Group, divestiture, not discontinued operations [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Notes receivable, current $ 2,853 $ 4,913