Quarterly report pursuant to Section 13 or 15(d)

Divestiture Activities - Narrative (Details)

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Divestiture Activities - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 13, 2019
Mar. 30, 2019
Dec. 31, 2018
Held for Sale | First Earnout      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Maximum total earnout proceeds   $ 35,000,000.0  
Held for Sale | Second Earnout      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Maximum total earnout proceeds   0  
Held for Sale | Test Systems Segment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment loss     $ 0
Divestiture by Sale | Test Systems Segment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total cash proceeds of divesture $ 103,800,000    
Gain on sale, net of tax   80,100,000  
Income taxes from divesture   $ 21,300,000