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Disposal of Non-Core Products (Disposal of Non-Core Products) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 01, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Asset Purchase Agreement date         Apr. 01, 2019  
Proceeds from sale of productive assets $ 40,000          
Selling, general and administrative   $ 24,414 $ 30,978   $ 81,610 $ 94,088
Gain on disposal           33,599
Non-core Switches and Connector Product [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Services provided income per agreement recognized as reduction to selling general and administrative expenses     675     1,350
Disposal group, net sales   $ 0 10,770   0 19,824
Disposal group, operating income     1,072     1,072
Cash received for reimbursement of retention costs on disposal     170     $ 170
Control Devices [Member] | Non-core Switches and Connector Product [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Selling, general and administrative       $ 322    
Services provided income per agreement recognized as reduction to selling general and administrative expenses         $ 21  
Disposal group, net sales     4,160      
Disposal group, cost of goods sold     2,775      
Gain on disposal     $ 33,921