ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 255,474
Ending Balance	302,724
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	3,835
Amounts reclassified from accumulated other comprehensive loss	0
Net current-period other comprehensive income (loss)	3,835
Ending Balance	(10,651)
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 loss	(408)
Net current-period other comprehensive income (loss)	(408)
Ending Balance	(23,240)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(37,318)
Other comprehensive income before reclassifications	3,835
Amounts reclassified from accumulated other comprehensive loss	(408)
Net current-period other comprehensive income (loss)	3,427
Ending Balance	$ (33,891)