REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 614,880	$ 595,393	$ 1,832,190	$ 1,763,213
Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	276,403	235,789	787,709	693,728
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	338,477	359,604	1,044,481	1,069,485
Defense Aerospace [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	110,742	94,002	293,955	272,809
Defense Ground [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	22,231	25,167	69,383	68,463
Naval [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Net sales	143,430	116,620	424,371	352,456
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	109,015	101,872	320,237	305,893
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	88,543	106,842	278,194	307,477
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 140,919	$ 150,890	$ 446,050	$ 456,115
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	47.00%	49.00%	48.00%	46.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net Sales, Net, Percent	53.00%	51.00%	52.00%	54.00%