REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 578,314	$ 547,522
Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	230,633	205,161
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	347,681	342,361
Defense Aerospace [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	78,787	79,153
Defense Ground [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	20,758	22,519
Naval [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	131,088	103,489
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	103,221	99,404
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	96,480	98,319
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 147,980	$ 144,638
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales, Percent	48.00%	45.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net sales, Percent	52.00%	55.00%