ACCUMULATED OTHER COMPREHENSIVE LOSS 2 (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
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest Charges	$ (2,789)		$ (3,771)	$ (5,750)		$ (7,960)
Other Income and Expense	810		1,430	2,260		2,779
Income Before Income Taxes	6,090		5,124	62,374		61,139
Income Taxes	(2,269)		(1,887)	(23,040)		(22,864)
Net Income	3,821		3,237	39,334		38,275
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income Before Income Taxes	11			(804)
Income Taxes	(4)	[1]		329	[1]
Net Income	7			(475)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on Derivatives-Other [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest Charges	12			24
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Income and Expense	$ (1)			$ (828)

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