SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	$ 25,324
June 30, 2018	27,245
Accumulated Other Comprehensive Income, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	4,337
Current-period change	(630)
June 30, 2018	3,707
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	4,042
Current-period change	(630)
June 30, 2018	3,412
Pension Postretirement Benefit Obligation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	295
Current-period change	0
June 30, 2018	$ 295