ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance			$ 463,705
Other comprehensive income/(loss)	$ 311	$ 372	429	$ (1,763)
Ending Balance	516,422		516,422
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance			(5,114)
Ending Balance	(4,685)		(4,685)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance			(5,317)
Other comprehensive income/(loss)			850
Ending Balance	(4,467)		(4,467)
Postretirement Benefit Plan [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance			203
Other comprehensive income/(loss)			(421)
Ending Balance	$ (218)		$ (218)