Annual report pursuant to Section 13 and 15(d)

Divestiture Activities - Summary of Assets and Liabilities Held for Sale (Details)

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Divestiture Activities - Summary of Assets and Liabilities Held for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets Held for Sale $ 1,537 $ 19,358
Held for Sale | Test Systems    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Inventories   14,385
Prepaid Expenses and Other Current Assets   87
Net Property, Plant and Equipment $ 1,500 3,521
Other Assets   714
Intangible Assets, Net of Accumulated Amortization   651
Assets Held for Sale   19,358
Deferred Income Taxes   $ 906