ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (13,552)	[1]			$ (13,285)	[1]
Other comprehensive income before reclassifications	(23)				192
Amounts reclassified from AOCL	7	[2]			(475)	[2]
Other Comprehensive Gain (Loss) - Net of Tax	(16)	[1]	(129)	[1]	(283)	[1]	229	[1]
Ending balance	(13,568)	[1]			(13,568)	[1]
Combined statutory tax rate	41.00%		41.00%		41.00%		41.00%
Postretirement Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(12,958)	[1]			(12,958)	[1]
Other comprehensive income before reclassifications	0				0
Amounts reclassified from AOCL	0	[2]			0	[2]
Other Comprehensive Gain (Loss) - Net of Tax	0				0
Ending balance	(12,958)	[1]			(12,958)	[1]
Unrealized Gain (Loss) on Derivatives-Other [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(614)	[1]			(621)	[1]
Other comprehensive income before reclassifications	0				0
Amounts reclassified from AOCL	7	[2]			14	[2]
Other Comprehensive Gain (Loss) - Net of Tax	7				14
Ending balance	(607)	[1]			(607)	[1]
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	20	[1]			294	[1]
Other comprehensive income before reclassifications	(23)				192
Amounts reclassified from AOCL	0	[2]			(489)	[2]
Other Comprehensive Gain (Loss) - Net of Tax	(23)				(297)
Ending balance	$ (3)	[1]			$ (3)	[1]

[1] Determined using a combined statutory tax rate of 41% .

[2] See table below.