ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in accumulated other comprehensive loss [Abstract]
Net foreign currency translation adjustment		$ (707)	$ 550	$ 548	$ (2,130)
Net change in postretirement benefit plan (see Note 14 for further information) [Abstract]
Initial adoption of new plan	[1]	(444)	0	(444)	0
Amortization of prior service cost/(credit)		26	(5)	24	(9)
Amortization of gain		(2)	0	(5)	0
Total before tax		(420)	(5)	(425)	(9)
Tax		(6)	2	(5)	3
Net of tax		(426)	(3)	(430)	(6)
Total other comprehensive income (loss)		(1,133)	547	118	(2,136)
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance				463,705
Other comprehensive income/(loss)		(1,133)	$ 547	118	$ (2,136)
Ending Balance		496,154		496,154
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance				(5,114)
Ending Balance		(4,996)		(4,996)
Foreign Currency Translation Adjustment [Member]
Net change in postretirement benefit plan (see Note 14 for further information) [Abstract]
Total other comprehensive income (loss)				548
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance				(5,317)
Other comprehensive income/(loss)				548
Ending Balance		(4,769)		(4,769)
Postretirement Benefit Plan [Member]
Net change in postretirement benefit plan (see Note 14 for further information) [Abstract]
Total other comprehensive income (loss)				(430)
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance				203
Other comprehensive income/(loss)				(430)
Ending Balance		$ (227)		$ (227)

[1] See Note 14.