Annual report pursuant to Section 13 and 15(d)

DIVESTITURE ACTIVITIES - Narrative (Details)

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DIVESTITURE ACTIVITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 14, 2022
Oct. 06, 2021
Feb. 13, 2021
Jul. 12, 2019
Feb. 13, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Net Gain on Sale of Facility           $ 5,014 $ 0 $ 5,014 $ 0 $ 0
Facilities in Aerospace Segment                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Proceeds from sale of facilities                 $ 1,500  
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          
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                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Total cash proceeds of divesture         103,800          
Gain on sale, net of tax         80,100          
Income taxes from divesture         $ 19,700          
Contingent earn-outs     $ 10,700              
Held for Sale | Test Systems | Subsequent Event                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Contingent earn-outs $ 11,200                  
Disposed of by Sale | Airfield Lighting Product Line                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Proceeds from sale       $ 1,000            
Percentage of revenue (as a percentage)       1.00%            
Pre-tax loss on sale       $ (1,300)            
Disposal Group, Held-for-sale, Not Discontinued Operations | Facilities in Aerospace Segment                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Held for sale   $ 9,200                
Proceeds from sale of facilities   $ 8,800                
Net Gain on Sale of Facility               $ 5,000