Annual report pursuant to Section 13 and 15(d)

Segments - Narrative (Details)

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Segments - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information      
Impairment Loss $ 1,610,000 $ 0  
Goodwill 144,970,000 124,952,000 $ 125,645,000
Intangible asset impairment charge   0 0
Aerospace      
Segment Reporting Information      
Impairment Loss 1,610,000    
Goodwill 123,038,000 124,952,000 125,645,000
Intangible asset impairment charge 6,200,000    
Test Systems      
Segment Reporting Information      
Impairment Loss 0    
Goodwill 21,932,000 0 0
Operating Segments | Aerospace      
Segment Reporting Information      
Impairment Loss 0 0 $ 16,200,000
Purchased intangible impairment loss 0 0  
Goodwill 123,000,000.0 125,000,000.0  
Operating Segments | Test Systems      
Segment Reporting Information      
Impairment Loss 0 0  
Purchased intangible impairment loss 0 0  
Goodwill $ 21,900,000 $ 0