ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of components of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance		$ (17,969)	$ (17,833)
Change during the period:
Before-tax amount		709	(1,520)
Tax benefit		1	17
Reclassification adjustment, net of taxes:
Amortization of net loss	[1]	380	376
Total activity for the period		1,090	(1,127)
Balance		(16,879)	(18,960)
Pension Adjustment
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance		(14,715)	(16,246)
Change during the period:
Before-tax amount
Tax benefit
Reclassification adjustment, net of taxes:
Amortization of net loss	[1]	380	376
Total activity for the period		380	376
Balance		(14,335)	(15,870)
Unrealized Gain (Loss) On Securities
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance		36	(98)
Change during the period:
Before-tax amount		(3)	(46)
Tax benefit		1	17
Reclassification adjustment, net of taxes:
Amortization of net loss
Total activity for the period		(2)	(29)
Balance		34	(127)
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance		(3,290)	(1,489)
Change during the period:
Before-tax amount		712	(1,474)
Tax benefit
Reclassification adjustment, net of taxes:
Amortization of net loss
Total activity for the period		712	(1,474)
Balance		$ (2,578)	$ (2,963)

[1] Reported as part of selling, general and administrative expenses.