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Discontinued Operations of TS Segment (Details) - Modcom GmbH
€ in Thousands, $ in Thousands
3 Months Ended
Jul. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 31, 2018
EUR (€)
Jul. 31, 2018
USD ($)
Disposal Group, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash at closing         $ 14,400
Original purchase price         11,700
Adjustment at closing         $ 2,700
Amount in escrow | €       € 400  
Gain recorded due to sale of stock $ 16,800        
Discontinued Operations, Held-for-sale          
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]          
Sales   $ 0 $ 5,369    
Cost of sales   0 4,599    
Gross profit   0 770    
Selling, general and administrative expenses   0 928    
Operating loss   0 (158)    
Other expenses   0 (98)    
Loss before income taxes   0 (256)    
Income tax benefit   0 (51)    
Loss from discontinued operations, net of tax   $ 0 $ (205)