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Statements of Consolidated Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Tax provision for recognized net acturial loss	$ 156	$ 106	$ 207
Tax provision (benefit) on unfunded pension obligation	(2,331)	96	646
Purchase of common shares	52,392	32,687	3,000
Issuance of common shares	26,353	14,168	27,468
Cash dividends declared per share	$ 0.80	$ 0.80	$ 0.80
Common Shares
Purchase of common shares	52,392	32,687	3,000
Issuance of common shares	26,353	14,168	27,468
Restricted shares awards	88,692	41,198
Paid in Capital
Issuance of common shares	26,353	14,168	27,468
Restricted shares awards	88,692	41,198
Retained Earnings
Purchase of common shares	52,392	32,687	3,000
Cash dividends declared per share	$ 0.80	$ 0.80	$ 0.80
Accumulated Other Comprehensive Income (Loss) Unrecognized Pension Benefit Cost
Tax provision for recognized net acturial loss	156	106	207
Tax provision (benefit) on unfunded pension obligation	$ (2,331)	$ 96	$ 646

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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Tax effect on the accumulated change in the value of either the projected benefit obligation or plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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For each annual statement of income presented, the tax effect of the net gain (loss) recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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