REVENUE - Net sales by market (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Product/Service Transferred Over Time	$ 26,878		$ 76,886
Product Transferred at Point in Time	1,317		4,055
Noncash Consideration	1,363		3,602
Total Net Sales by Market	29,558	$ 28,310	84,543	$ 86,762
Aerospace and Defense
Product/Service Transferred Over Time	3,931		12,675
Product Transferred at Point in Time	50		170
Noncash Consideration	203		599
Total Net Sales by Market	4,184		13,444
Medical
Product/Service Transferred Over Time	13,461		34,513
Product Transferred at Point in Time	151		720
Noncash Consideration	668		1,605
Total Net Sales by Market	14,280		36,838
Industrial
Product/Service Transferred Over Time	9,486		29,698
Product Transferred at Point in Time	1,116		3,165
Noncash Consideration	492		1,398
Total Net Sales by Market	$ 11,094		$ 34,261