ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance December 31, 2015, net of tax		$ (9,819)	$ (4,382)
Other comprehensive income before reclassification		(151)	14
Plan adjustment cost		(834)
Reclassification to net income		282	156
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME		(703)	170
Balance March 31, 2016, net of tax		(10,522)	(4,212)
Unrealized gain (loss) on marketable securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance December 31, 2015, net of tax		(111)	(28)
Other comprehensive income before reclassification		(151)	14
Plan adjustment cost		0
Reclassification to net income		0	0
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME		(151)	14
Balance March 31, 2016, net of tax		(262)	(14)
Actuarial loss on retirement plan [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance December 31, 2015, net of tax	[1]	(9,708)	(4,354)
Other comprehensive income before reclassification		0	0
Plan adjustment cost		(834)
Reclassification to net income		282	156
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME		(552)	156
Balance March 31, 2016, net of tax		$ (10,260)	$ (4,198)

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