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Summary of Significant Accounting Policies (Disposal of Non-Core Products) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Proceeds from sale of productive assets $ 40,000          
Gain on disposal       $ 33,599    
Selling, general and administrative       123,853 $ 138,553 $ 141,893
Inventory, finished goods, gross       21,510 20,186  
Non-core Switches and Connector Product [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Inventory adjustments 1,573          
Disposal group, net sales       41,560 44,537 43,339
Disposal group, operating income       4,831 $ 9,086 $ 7,991
Control Devices [Member] | Non-core Switches and Connector Product [Member]            
Gain on disposal   $ 33,599        
Control Devices [Member] | Non-core Switches and Connector Product [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Disposal group, sales after disposal       26,304    
Disposal Group, operating income after disposal       1,458    
Disposal group, net sales 4,160          
Disposal group, cost of goods sold 2,775          
Gain on disposal $ 33,921          
Selling, general and administrative     $ 322      
Services provided income per agreement recognized as reduction to selling general and administrative expenses       1,824    
Cash received for reimbursement of retention and facility costs on disposal       $ 745