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 ($)
 3 Months Ended 12 Months Ended
Oct. 03, 2021
Mar. 28, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill          
Goodwill, Beginning Balance   $ 144,970,000 $ 58,282,000 $ 144,970,000  
Acquisitions and Divestitures       (298,000)  
Impairment Charge $ 0   0 (86,312,000) $ (1,600,000)
Foreign Currency Translations and Other     0 (78,000)  
Goodwill, Ending Balance     58,282,000 58,282,000 144,970,000
Goodwill, Gross     178,983,000    
Accumulated Impairment Losses     (120,701,000)    
Goodwill, Net     58,282,000 58,282,000 144,970,000
Aerospace          
Goodwill          
Goodwill, Beginning Balance   123,038,000 36,648,000 123,038,000  
Acquisitions and Divestitures       0  
Impairment Charge   (86,300,000)   (86,312,000)  
Foreign Currency Translations and Other     0 (78,000)  
Goodwill, Ending Balance     36,648,000 36,648,000 123,038,000
Goodwill, Gross     157,349,000    
Accumulated Impairment Losses     (120,701,000)    
Goodwill, Net     36,648,000 36,648,000 123,038,000
Test Systems          
Goodwill          
Goodwill, Beginning Balance   $ 21,932,000 21,634,000 21,932,000  
Acquisitions and Divestitures       (298,000)  
Impairment Charge       0  
Foreign Currency Translations and Other     0 0  
Goodwill, Ending Balance     21,634,000 21,634,000 21,932,000
Goodwill, Gross     21,634,000    
Accumulated Impairment Losses     0    
Goodwill, Net     $ 21,634,000 $ 21,634,000 $ 21,932,000