Annual report pursuant to Section 13 and 15(d)

Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details)

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Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Goodwill      
Goodwill, Beginning Balance $ 124,952,000 $ 125,645,000  
Acquisitions and Divestitures 21,670,000 241,000  
Impairment Charge (1,610,000) 0  
Foreign Currency Translations and Other (42,000) (452,000)  
Goodwill, Ending Balance 144,970,000 124,952,000  
Goodwill, Gross     $ 179,359,000
Accumulated Impairment Losses     (34,389,000)
Goodwill, Net 144,970,000 125,645,000 144,970,000
Aerospace      
Goodwill      
Goodwill, Beginning Balance 124,952,000 125,645,000  
Acquisitions and Divestitures (262,000) 241,000  
Impairment Charge (1,610,000)    
Foreign Currency Translations and Other (42,000) (452,000)  
Goodwill, Ending Balance 123,038,000 124,952,000  
Goodwill, Gross     157,427,000
Accumulated Impairment Losses     (34,389,000)
Goodwill, Net 123,038,000 124,952,000 123,038,000
Test Systems      
Goodwill      
Goodwill, Beginning Balance 0 0  
Acquisitions and Divestitures 21,932,000 0  
Impairment Charge 0    
Foreign Currency Translations and Other 0 0  
Goodwill, Ending Balance 21,932,000 0  
Goodwill, Gross     21,932,000
Accumulated Impairment Losses     0
Goodwill, Net $ 21,932,000 $ 0 $ 21,932,000