ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (13,285)	[1]
Other comprehensive income before reclassifications	1,524
Amounts reclassified from AOCL	892	[2]
Other Comprehensive Gain (Loss) - Net of Tax	2,416	[1]	(1,156)	[1]	(3,009)	[1]
Ending balance	(10,869)	[1]	(13,285)	[1]
Combined statutory tax rate	41.00%
Postretirement Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(12,958)	[1]	(11,275)	[1]	(8,599)	[1]
Other comprehensive income before reclassifications	932
Amounts reclassified from AOCL	1,354	[2]
Other Comprehensive Gain (Loss) - Net of Tax	2,286	[1]	(1,683)	[1]	(2,676)	[1]
Ending balance	(10,672)	[1]	(12,958)	[1]	(11,275)	[1]
Unrealized Gain (Loss) on Derivatives-Other [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(621)	[1]	(648)	[1]	(675)	[1]
Other comprehensive income before reclassifications	0
Amounts reclassified from AOCL	27	[2]
Other Comprehensive Gain (Loss) - Net of Tax	27	[1]	27	[1]	27	[1]
Ending balance	(594)	[1]	(621)	[1]	(648)	[1]
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	294	[1]	(206)	[1]	154	[1]
Other comprehensive income before reclassifications	592
Amounts reclassified from AOCL	(489)	[2]
Other Comprehensive Gain (Loss) - Net of Tax	103	[1]	500	[1]	(360)	[1]
Ending balance	$ 397	[1]	$ 294	[1]	$ (206)	[1]

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

[2] See table below.