Annual report pursuant to Section 13 and 15(d)

Divestiture Activities - Narrative (Details)

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Divestiture Activities - Narrative (Details) - Held for Sale - USD ($)
3 Months Ended 12 Months Ended
Feb. 13, 2019
Mar. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Maximum total earnout proceeds     $ 35,000,000
Test Systems      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment loss     $ 0
Test Systems | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total cash proceeds of divesture $ 103,500,000    
Cash at closing 100,000,000.0    
Sale of inventory 3,500,000    
Gain on sale, net of tax $ 80,000,000    
Income taxes from divesture   $ 22,000,000