REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net Sales	$ 648,622	$ 595,393	$ 620,298	$ 547,522	$ 611,881	$ 567,901	$ 567,653	$ 523,591	$ 2,411,835	$ 2,271,026	$ 2,108,931
Defense
Disaggregation of Revenue [Line Items]
Net Sales									960,558	876,941	792,912
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									$ 1,451,277	1,394,085	1,316,019
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percent									46.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percent									54.00%
Defense Aerospace [Member] | Defense
Disaggregation of Revenue [Line Items]
Net Sales									$ 376,951	372,678	303,430
Defense Ground [Member] | Defense
Disaggregation of Revenue [Line Items]
Net Sales									97,131	96,042	86,139
Naval [Member] | Defense
Disaggregation of Revenue [Line Items]
Net Sales									486,476	408,221	403,343
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									414,422	409,384	397,327
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									431,793	423,747	409,201
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									$ 605,062	$ 560,954	$ 509,491