ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (20,760)	[1]
Other comprehensive income before reclassifications	62
Amounts reclassified from AOCL	48	[2]
Other Comprehensive Income - Net of Tax	110	[1]	4,806	[1]
Ending balance	(20,650)	[1]
Combined statutory tax rate	41.00%		41.00%
Postretirement Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(18,503)	[1]
Other comprehensive income before reclassifications	0
Amounts reclassified from AOCL	0	[2]
Other Comprehensive Income - Net of Tax	0
Ending balance	(18,503)	[1]
Unrealized Gain (Loss) on Derivatives-Other [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,697)	[1]
Other comprehensive income before reclassifications	0
Amounts reclassified from AOCL	66	[2]
Other Comprehensive Income - Net of Tax	66
Ending balance	(2,631)	[1]
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	397	[1]
Other comprehensive income before reclassifications	62
Amounts reclassified from AOCL	0	[2]
Other Comprehensive Income - Net of Tax	62
Ending balance	459	[1]
Other Comprehensive Income (Loss) of Affiliated Companies [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	43	[1]
Other comprehensive income before reclassifications	0
Amounts reclassified from AOCL	(18)	[2]
Other Comprehensive Income - Net of Tax	(18)
Ending balance	$ 25	[1]

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

[2] See table below.