REVENUE - Net sales by market (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Product/Service Transferred Over Time	$ 25,958	$ 50,007
Product Transferred at Point in Time	1,365	2,738
Noncash Consideration	1,215	2,240
Total Net Sales by Market	28,538	54,985
Aerospace and Defense
Product/Service Transferred Over Time	4,001	8,717
Product Transferred at Point in Time	72	120
Noncash Consideration	196	393
Total Net Sales by Market	4,269	9,230
Medical
Product/Service Transferred Over Time	11,934	21,201
Product Transferred at Point in Time	87	569
Noncash Consideration	544	945
Total Net Sales by Market	12,565	22,715
Industrial
Product/Service Transferred Over Time	10,023	20,089
Product Transferred at Point in Time	1,206	2,049
Noncash Consideration	475	902
Total Net Sales by Market	$ 11,704	$ 23,040