Summary Of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	$ 154,190		$ 2,593		$ 156,599		$ 5,459
Income tax expense	84,878		1,102		85,772		2,086
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	69,312		1,491		70,827		3,373
Tax benefit (expense) (a)	(16,691)		(14,310)		(43,973)		(38,562)
Net income	(100,582)		(25,730)		(149,563)		(68,831)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income Loss Reclassification Adjustment From AOCI For Realized Losses on Sale of Securities Before Tax	(735)		0		(735)	[1]	0	[1]
Income before income taxes	735		(16)		732		(18)
Income tax expense	273		(6)		272	[1]	(7)	[1]
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	462		(10)		460		(11)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0		16		3	[1]	18	[1]
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	174		282		344		565
Tax benefit (expense) (a)	62		99		121		198
Net income	112		183		223		367
Amortization of net loss	(1,952)	[2]	(4,891)	[2]	(3,904)	[2]	(9,782)	[2]
Adjustment due to effects of regulation	$ 1,778	[2]	$ 4,609	[2]	$ 3,560	[2]	$ 9,217	[2]

[1] These amounts were included as part of net income from discontinued operations for all periods presented (see Note 5 for additional details).

[2] These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details).