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	$ (26,299)	[1]			$ (31,105)	[1]
Other comprehensive income before reclassifications	(23)				192
Amounts reclassified from AOCL	88	[2]			4,679	[2]
Other Comprehensive Income (Loss) - Net of Tax	65	[1]	(231)	[1]	4,871	[1]	(1,972)	[1]
Ending balance	(26,234)	[1]			(26,234)	[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	(23,437)	[1]			(23,437)	[1]
Other comprehensive income before reclassifications	0				0
Amounts reclassified from AOCL	0	[2]			0	[2]
Other Comprehensive Income (Loss) - Net of Tax	0				0
Ending balance	(23,437)	[1]			(23,437)	[1]
Unrealized Gain (Loss) on Derivatives-Other [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,896)	[1]			(2,962)	[1]
Other comprehensive income before reclassifications	0				0
Amounts reclassified from AOCL	66	[2]			132	[2]
Other Comprehensive Income (Loss) - Net of Tax	66				132
Ending balance	(2,830)	[1]			(2,830)	[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 Income (Loss) - Net of Tax	(23)				(297)
Ending balance	(3)	[1]			(3)	[1]
Other Comprehensive Income (Loss) of Affiliated Companies [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	14	[1]			(5,000)	[1]
Other comprehensive income before reclassifications	0				0
Amounts reclassified from AOCL	22	[2]			5,036	[2]
Other Comprehensive Income (Loss) - Net of Tax	22				5,036
Ending balance	$ 36	[1]			$ 36	[1]

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

[2] See table below.