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Income Taxes (Schedule of Income Tax Allocation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Allocated to net income	$ 13,535us-gaap_IncomeTaxExpenseBenefit	$ 12,081us-gaap_IncomeTaxExpenseBenefit	$ (16,952)us-gaap_IncomeTaxExpenseBenefit
Allocated to stockholders' equity, for unrealized holding gain/loss on debt and equity securities for financial reporting purposes	518us-gaap_OtherComprehensiveIncomeLossTax	(2,072)us-gaap_OtherComprehensiveIncomeLossTax	(237)us-gaap_OtherComprehensiveIncomeLossTax
Allocated to stockholders' equity, for tax benefit of pension liabilities	(2,103)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther	3,399us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther	5,824us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther
Total income taxes	$ 11,950us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation	$ 13,408us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation	$ (11,365)us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation

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- Definition

The tax effect of items occurring during the period that have been charged or credited directly to components of shareholders' equity and are not otherwise defined.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 20

-Section 45

-Paragraph 11

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Number 210

-Section 08

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-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

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The sum of income tax expense or benefit for the period that has been allocated among continuing operations, discontinued operations, extraordinary items, other comprehensive income, and items charged or credited directly to shareholders' equity.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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-Name Regulation S-X (SX)

-Number 210

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