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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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- Definition Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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