REVENUE DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net Sales	$ 655,771	$ 614,880	$ 638,996	$ 578,314	$ 648,622	$ 595,393	$ 620,298	$ 547,522	$ 2,487,961	$ 2,411,835	$ 2,271,026
Defense
Disaggregation of Revenue [Line Items]
Net Sales									1,079,049	960,558	876,941
Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									1,408,912	1,451,277	1,394,085
Defense Aerospace [Member] | Defense
Disaggregation of Revenue [Line Items]
Net Sales									416,841	376,951	372,678
Defense Ground [Member] | Defense
Disaggregation of Revenue [Line Items]
Net Sales									93,432	97,131	96,042
Naval [Member] | Defense
Disaggregation of Revenue [Line Items]
Net Sales									568,776	486,476	408,221
Commercial Aerospace [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									433,038	414,422	409,384
Power Generation [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									392,173	431,793	423,747
General Industrial [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Net Sales									$ 583,701	$ 605,062	$ 560,954
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percent									49.00%	46.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percent									51.00%	54.00%