SIGNIFICANT ACCOUNTING POLICIES - Rollforward of Allowance for Doubtful Accounts (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, December 31, 2019	$ 967
Adjustment for cumulative effect from change in accounting principle	50
Current period provision for expected credit losses	3,327
Write-offs charged against the allowance	(1,267)
Recoveries of amounts previously reserved	(342)
Impacts of foreign currency exchange rates and other	(26)
Allowance for doubtful accounts, September 30, 2020	2,709
DynaEnergetics
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, December 31, 2019	945
Adjustment for cumulative effect from change in accounting principle	50
Current period provision for expected credit losses	3,015
Write-offs charged against the allowance	(1,066)
Recoveries of amounts previously reserved	(208)
Impacts of foreign currency exchange rates and other	(27)
Allowance for doubtful accounts, September 30, 2020	2,709
NobelClad
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, December 31, 2019	22
Adjustment for cumulative effect from change in accounting principle	0
Current period provision for expected credit losses	312
Write-offs charged against the allowance	(201)
Recoveries of amounts previously reserved	(134)
Impacts of foreign currency exchange rates and other	1
Allowance for doubtful accounts, September 30, 2020	$ 0