ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (4,382)		$ (4,368)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	14		28
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	156		94
Other comprehensive income (loss)	(170)		(122)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,212)		(4,246)
Unrealized gain (loss) on marketable securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(28)		(24)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	14		28
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	14		28
Accumulated Other Comprehensive Income (Loss), Net of Tax	(14)		4
Actuarial loss on retirement plan [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,354)	[1]	(4,344)	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	156		94
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	156		94
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (4,198)		$ (4,250)

[1] Refer to Note 12: Supplemental Executive Retirement Plan.