SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	$ 25,324
March 31, 2019	25,646
Accumulated Other Comprehensive Income, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	4,337
Current-period change	(441)
March 31, 2019	3,896
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	4,042
Current-period change	(441)
March 31, 2019	3,601
Pension Postretirement Benefit Obligation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
March 31, 2018	295
Current-period change	0
March 31, 2019	$ 295