REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 547,522	$ 523,591
Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	205,315	183,041
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	342,207	340,550
Defense Aerospace [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	75,941	65,293
Defense Ground [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	22,011	19,737
Naval [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	102,782	90,970
Defense Other [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	4,581	7,041
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	99,404	98,614
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	99,012	105,551
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 143,791	$ 136,385
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales, Percent	31.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net sales, Percent	69.00%