Accumulated Other Comprehensive Loss (Schedule of Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (29,995)	$ (65,139)	$ (48,549)	$ (32,266)
Other comprehensive (loss) income before reclassifications	(7,203)	4,445	11,258	(32,349)
Amounts reclassified from accumulated other comprehensive (loss) income	1,279	1,753	1,372	5,674
Net current-period other comprehensive (loss) income, net of tax	(5,924)	6,198	12,630	(26,675)
Ending balance	(35,919)	(58,941)	(35,919)	(58,941)
Available For Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	21,256	2,729	(2,617)	42,741
Other comprehensive (loss) income before reclassifications	(8,133)	5,330	18,420	(34,400)
Amounts reclassified from accumulated other comprehensive (loss) income	36	(173)	(2,644)	(455)
Net current-period other comprehensive (loss) income, net of tax	(8,097)	5,157	15,776	(34,855)
Ending balance	13,159	7,886	13,159	7,886
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(24,450)	(22,872)	(18,206)	(27,902)
Other comprehensive (loss) income before reclassifications	493	(1,413)	(8,534)	467
Amounts reclassified from accumulated other comprehensive (loss) income	1,180	1,400	3,963	4,550
Net current-period other comprehensive (loss) income, net of tax	1,673	(13)	(4,571)	5,017
Ending balance	(22,777)	(22,885)	(22,777)	(22,885)
Defined Benefit Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(26,801)	(44,996)	(27,726)	(47,105)
Other comprehensive (loss) income before reclassifications	437	528	1,372	1,584
Amounts reclassified from accumulated other comprehensive (loss) income	63	526	53	1,579
Net current-period other comprehensive (loss) income, net of tax	500	1,054	1,425	3,163
Ending balance	$ (26,301)	$ (43,942)	$ (26,301)	$ (43,942)

- 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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