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Stock compensation plans (Tables)

12 Months Ended

Dec. 31, 2012

Weighted-Average Assumptions used to Estimate Fair Value of Options Granted

The following weighted-average assumptions were used:

		2012				2011				2010
Risk-free interest rate			0.81	%			1.92	%			2.12	%
Expected life of option			4.85 yrs.				4.70 yrs.				4.66 yrs.
Expected dividend yield			2.28	%			2.34	%			2.22	%
Expected volatility			28.46	%			26.82	%			26.42	%

Weighted-Average Assumptions used to Estimate Fair Value of Non-Vested Shares Granted

The following weighted-average assumptions were used:

		2012				2011				2010
Risk-free interest rate			0.37	%			1.04	%			1.25	%
Expected dividend yield			2.24	%			2.34	%			2.24	%

Summary of Stock Option Activity

The following table summarizes the option activity during 2012:

		Shares Subject to Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life In Years				Aggregate Intrinsic Value
														(Dollars in thousands)
Outstanding, beginning of the year			1,132,546			$	57.17
Granted			431,667				59.85
Exercised			(204,082	)			51.66
Forfeited or expired			(275,938	)			60.50
Outstanding, end of the year			1,084,193			$	58.43				7.0			$	14,037
Exercisable, end of the year			558,768			$	57.53				5.4			$	7,772

Summary of Non-Vested Restricted Stock Unit Activity

The following table summarizes the non-vested restricted stock unit activity during 2012:

		Number of Non-Vested Shares				Weighted Average Grant- Date Fair Value				Weighted Average Remaining Contractual Life  In Years				Aggregate Intrinsic Value
														(Dollars in thousands)
Outstanding, beginning of the year			334,459			$	56.60
Granted			178,690				56.95
Vested			(78,753	)			45.54
Forfeited			(69,608	)			54.92
Outstanding, end of the year			364,788			$	55.77				1.3			$	26,013

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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-Publisher FASB

-Name Accounting Standards Codification

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

-Publisher FASB

-Name Accounting Standards Codification

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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