BUSINESS SEGMENTS - Segment Operations and Assets (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of segments | segment									2
Segment Operations [Abstract]
Net sales	$ 57,113	$ 55,281	$ 43,203	$ 73,564	$ 86,367	$ 100,094	$ 110,954	$ 100,135	$ 229,161	$ 397,550	$ 326,429
Segment operating income before income taxes									(996)	58,425	37,424
Other expense, net									(233)	(169)	(1,202)
Interest expense, net									(731)	(1,554)	(1,615)
(Loss) income before income taxes									(1,960)	56,702	34,607
Consolidated depreciation and amortization									11,081	9,860	9,520
Consolidated acquisition of property, plant and equipment									13,853	27,210	45,095
Segment Assets [Abstract]
Assets	279,645				277,421				279,645	277,421
Cash and cash equivalents	28,187				20,353				28,187	20,353
Deferred tax assets	10,668				10,834				10,668	10,834
Corporate property, plant and equipment	109,411				108,234				109,411	108,234
Operating segments
Segment Operations [Abstract]
Segment operating income before income taxes									13,036	75,974	50,975
Consolidated depreciation and amortization									10,767	9,421	9,520
Consolidated acquisition of property, plant and equipment									13,716	25,345	43,322
Segment Assets [Abstract]
Assets	192,983				223,980				192,983	223,980
Segment reconciling items
Segment Operations [Abstract]
Unallocated corporate expenses									(8,357)	(12,345)	(9,971)
Stock-based compensation									(5,675)	(5,204)	(3,580)
Segment Assets [Abstract]
Cash and cash equivalents	28,187				20,353				28,187	20,353
Marketable securities	25,736				0				25,736	0
Prepaid expenses and other assets	24,125				24,535				24,125	24,535
Deferred tax assets	4,582				3,836				4,582	3,836
Corporate and other
Segment Operations [Abstract]
Consolidated depreciation and amortization									314	439	0
Consolidated acquisition of property, plant and equipment									137	1,865	1,773
Segment Assets [Abstract]
Corporate property, plant and equipment	4,032				4,717				4,032	4,717
DynaEnergetics
Segment Operations [Abstract]
Net sales									146,395	310,424	237,448
DynaEnergetics | Operating segments
Segment Operations [Abstract]
Segment operating income before income taxes									6,150	68,781	44,476
Consolidated depreciation and amortization									7,263	6,375	6,308
Consolidated acquisition of property, plant and equipment									11,741	19,785	41,041
Segment Assets [Abstract]
Assets	132,775				165,775				132,775	165,775
NobelClad
Segment Operations [Abstract]
Net sales									82,766	87,126	88,981
NobelClad | Operating segments
Segment Operations [Abstract]
Segment operating income before income taxes									6,886	7,193	6,499
Consolidated depreciation and amortization									3,504	3,046	3,212
Consolidated acquisition of property, plant and equipment									1,975	5,560	$ 2,281
Segment Assets [Abstract]
Assets	$ 60,208				$ 58,205				$ 60,208	$ 58,205