ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 255,474
Ending Balance	287,934
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(14,486)
Other comprehensive income before reclassifications	5,616
Amounts reclassified from accumulated other comprehensive income	0
Net current-period other comprehensive income (loss)	5,616
Ending Balance	(8,870)
Pension and Other Post-Retirement Liability Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(22,832)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	(272)
Net current-period other comprehensive income (loss)	(272)
Ending Balance	(23,104)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(37,318)
Other comprehensive income before reclassifications	5,616
Amounts reclassified from accumulated other comprehensive income	(272)
Net current-period other comprehensive income (loss)	5,344
Ending Balance	$ (31,974)