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ACQUISITIONS Narrative (Details)
$ in Thousands
6 Months Ended
Oct. 30, 2020
USD ($)
Apr. 20, 2020
USD ($)
Feb. 28, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
NumberAcquisitions
Business Acquisition [Line Items]          
Number of Businesses Acquired | NumberAcquisitions         2
Revenue of Acquiree since Acquisition Date, Actual       $ 7,000  
Earnings or Loss of Acquiree since Acquisition Date, Actual         $ (1,000)
Payments for (Proceeds from) Previous Acquisition       $ (5,000)  
2020 acquisitions [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         $ 89,605
Defense Electronics [Member] | Pacific Star Communications, Inc. (PacStar)          
Business Acquisition [Line Items]          
Effective Date of Acquisition Oct. 30, 2020        
Acquisition of businesses, net of cash acquired $ 406,000        
Defense Electronics [Member] | Integrated Air Defense System (IADS) [Member]          
Business Acquisition [Line Items]          
Effective Date of Acquisition   Apr. 20, 2020      
Acquisition of businesses, net of cash acquired   $ 29,000      
Naval & Power [Member] | Dyna-Flo Valve Services Ltd. (Dyna-Flo) [Member]          
Business Acquisition [Line Items]          
Effective Date of Acquisition     Feb. 28, 2020    
Acquisition of businesses, net of cash acquired     $ 60,000