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Discontinued Operations (Narrative) (Details)
Dec. 31, 2018
shares
Aug. 31, 2018
shares
Aug. 07, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Distribution of shares outstanding to shareholders, conversion ratio 1.980295    
Arlo      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Ownership percentage     84.20%
Shares, outstanding (in shares)   62,500,000  
Number of shares distributed (in shares) 62,500,000