Other Comprehensive Income (Schedule of Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (65,139)	$ (43,878)	$ (32,266)	$ (60,204)
Other comprehensive (loss) income before reclassifications	4,445	13,793	(32,349)	28,281
Amounts reclassified from accumulated other comprehensive (loss) income	1,753	808	5,674	2,646
Net current-period other comprehensive (loss) income, net of tax	6,198	14,601	(26,675)	30,927
Ending balance	(58,941)	(29,277)	(58,941)	(29,277)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(22,872)	(28,396)	(27,902)	(28,884)
Other comprehensive (loss) income before reclassifications	(1,413)	(1,384)	467	(3,065)
Amounts reclassified from accumulated other comprehensive (loss) income	1,400	676	4,550	2,845
Net current-period other comprehensive (loss) income, net of tax	(13)	(708)	5,017	(220)
Ending balance	(22,885)	(29,104)	(22,885)	(29,104)
Available For Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	2,729	29,768	42,741	15,967
Other comprehensive (loss) income before reclassifications	5,330	14,817	(34,400)	30,267
Amounts reclassified from accumulated other comprehensive (loss) income	(173)	(527)	(455)	(2,176)
Net current-period other comprehensive (loss) income, net of tax	5,157	14,290	(34,855)	28,091
Ending balance	7,886	44,058	7,886	44,058
Defined Benefit Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(44,996)	(45,250)	(47,105)	(47,287)
Other comprehensive (loss) income before reclassifications	528	360	1,584	1,079
Amounts reclassified from accumulated other comprehensive (loss) income	526	659	1,579	1,977
Net current-period other comprehensive (loss) income, net of tax	1,054	1,019	3,163	3,056
Ending balance	$ (43,942)	$ (44,231)	$ (43,942)	$ (44,231)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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