ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of components of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at December 31		$ (17,969)	$ (17,833)
Change during the period:
Before-tax amount		678	(998)
Tax benefit		5	11
Reclassification adjustment, net of taxes:
Amortization of net loss	[1]	127	125
Total activity for the period		810	(884)
Balance at March 31		(17,159)	(18,717)
Pension Adjustment
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at December 31		$ (14,715)	$ (16,246)
Change during the period:
Before-tax amount
Tax benefit
Reclassification adjustment, net of taxes:
Amortization of net loss	[1]	$ 127	$ 125
Total activity for the period		127	125
Balance at March 31		(14,588)	(16,121)
Unrealized Gain (Loss) On Securities
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at December 31		36	(98)
Change during the period:
Before-tax amount		(14)	31
Tax benefit		$ 5	$ (11)
Reclassification adjustment, net of taxes:
Amortization of net loss	[1]
Total activity for the period		$ (9)	$ 20
Balance at March 31		27	(78)
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Roll Forward]
Balance at December 31		(3,290)	(1,489)
Change during the period:
Before-tax amount		$ 692	$ (1,029)
Tax benefit
Reclassification adjustment, net of taxes:
Amortization of net loss	[1]
Total activity for the period		$ 692	$ (1,029)
Balance at March 31		$ (2,598)	$ (2,518)

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