REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 595,393	$ 567,901	$ 1,763,213	$ 1,659,145
Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	237,666	228,514	696,948	624,449
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	357,727	339,387	1,066,265	1,034,696
Defense Aerospace [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	91,919	93,005	266,128	247,666
Defense Ground [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	24,798	27,820	67,081	65,071
Naval [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	115,142	102,617	349,928	293,635
Defense Other [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	5,807	5,072	13,811	18,077
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	101,872	104,961	305,893	303,928
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	105,757	92,089	306,843	312,414
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 150,098	$ 142,337	$ 453,529	$ 418,354
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	36.00%		33.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	64.00%		67.00%