REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 601,231	$ 578,314
Defense
Disaggregation of Revenue [Line Items]
Net sales	290,178	230,633
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	311,053	347,681
Defense Aerospace [Member] | Defense
Disaggregation of Revenue [Line Items]
Net sales	101,828	78,787
Defense Ground [Member] | Defense
Disaggregation of Revenue [Line Items]
Net sales	22,657	20,758
Naval [Member] | Defense
Disaggregation of Revenue [Line Items]
Net sales	165,693	131,088
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	100,680	103,221
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	84,348	96,480
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 126,025	$ 147,980
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	52.00%	48.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	48.00%	52.00%