REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 597,059	$ 601,231
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	401,936	390,857
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	195,123	210,374
Defense Aerospace [Member] | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	111,016	101,827
Defense Ground [Member] | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	55,746	22,657
Defense Naval [Member] | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	177,905	165,693
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	57,269	100,680
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	105,504	123,926
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 89,619	$ 86,448
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	52.00%	52.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	48.00%	48.00%