Statements of Consolidated Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax provision (benefit) for recognized net actuarial loss	$ 6	$ 187	$ 284
Tax provision (benefit)	(3,115)	2,506	(1,627)
Curtailment net of tax provision			2,376
Purchase of common shares	40,145	89,807	50,334
Issuance of common shares	3,531	34,575	20,365
Restricted shares awards	42,678	68,369	74,276
Common shares issued to rabbi trust	43,592	69,120	74,996
Cash dividends declared per share	$ 0.80	$ 0.60	$ 1.00
Common Shares [Member]
Purchase of common shares	40,145	89,807	50,334
Issuance of common shares	3,531	34,575	20,365
Restricted shares awards	42,678	68,369	74,276
Common Shares Issued to Rabbi Trust [Member]
Common shares issued to rabbi trust	43,592	69,120	74,996
Deferred Compensation Liability [Member]
Common shares issued to rabbi trust	43,592	69,120	74,996
Paid In Capital [Member]
Issuance of common shares	3,531	34,575	20,365
Restricted shares awards	42,678	68,369	74,276
Retained Earnings [Member]
Purchase of common shares	40,145	89,807	50,334
Cash dividends declared per share	$ 0.80	$ 0.6	$ 1
Unrecognized Pension Benefit Cost [Member]
Tax provision (benefit) for recognized net actuarial loss	6	187	284
Tax provision (benefit)	(3,115)	2,506	(1,627)
Curtailment net of tax provision			$ 2,376

Number of shares issued during the period related to shares held in employee trust.

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

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Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

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- Definition

Amount of tax expense (benefit) related to gain (loss) adjustment to other comprehensive income (loss) resulting from settlement or curtailment of pension and other postretirement defined benefit plans.

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- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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Number of new stock issued during the period.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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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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