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Retirement Plans (Changes in Fair Value of Securities Using Significant Unobservable Inputs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member]
Fair value of plan assets, beginning of year	$ 17,179	$ 18,764
Total gains (realized and unrealized) included in changes in net assets	1,949	969
Purchases, sales, issuances, and settlements	(3,948)	(2,554)
Transfers in and/or out of Level 3	0	0
Fair value of plan assets, end of year	15,180	17,179
Retirement Income Plan [Member]
Fair value of plan assets, beginning of year	173,311	139,749
Total gains (realized and unrealized) included in changes in net assets	6,526	15,743
Fair value of plan assets, end of year	$ 182,614	$ 173,311

X

- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6504226



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6504192



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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 715

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-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

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-Name Statement of Financial Accounting Standard (FAS)

-Number 87

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Number 132R

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-Subparagraph d(iv)(b)(i)

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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- Definition

Purchases, sales, and settlements of plan assets that occurred during the period.

+ References

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- Definition

Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.

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