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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Proceeds from sale of productive assets	$ 40,000
Selling, general and administrative				$ 112,474	$ 123,853	$ 138,553
Gain on disposal					33,599
Inventory, finished goods, gross				15,768	21,510
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
Disposal group, operating income					4,831	$ 9,086
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
Selling, general and administrative			$ 322
Services provided income per agreement recognized as reduction to selling general and administrative expenses				$ 21	1,824
Disposal group, net sales	4,160
Disposal group, cost of goods sold	2,775
Gain on disposal	$ 33,921
Cash received for reimbursement of retention and facility costs on disposal					$ 745

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