Other Comprehensive Income (Loss) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Roll Forward]
Beginning Balance	$ 22,858	$ 22,758	$ 26,356	$ 23,218
Other comprehensive (loss) income before reclassifications	(22,824)	4,407	(26,102)	3,949
Amounts reclassified from accumulated other comprehensive (loss) income	(45)	(561)	(265)	(562)
Net current-period other comprehensive loss (income)	(22,869)	3,885	(26,367)	3,426
Ending Balance	(11)	26,644	(11)	26,644
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Roll Forward]
Beginning Balance	(28,053)	(26,595)	(28,462)	(26,895)
Other comprehensive (loss) income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	397	435	806	735
Net current-period other comprehensive loss (income)	397	435	806	735
Ending Balance	(27,656)	(26,160)	(27,656)	(26,160)
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Beginning Balance	(5,195)	(3,837)	(2,106)	(3,677)
Other comprehensive (loss) income before reclassifications	(22,824)	4,407	(26,102)	3,949
Amounts reclassified from accumulated other comprehensive (loss) income	352	(87)	541	212
Net current-period other comprehensive loss (income)	(22,472)	4,320	(25,561)	4,161
Ending Balance	$ (27,667)	$ 484	$ (27,667)	$ 484

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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