Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Cumulative Repurchasing Activity by Plan

The following table summarizes by repurchase plan the Company’s repurchasing activity:

	Cumulative shares repurchased	Average price  per share
Non-Discretionary Plan (1994 through 2012)	24,444,917	$	23.46
Discretionary Plan (2001 through 2012)	27,871,019	$	35.71

Schedule of Stock Option Activity

The following table summarizes information about stock options:

	Number of shares		Weighted average exercise price per share		Weighted average remaining contractual life	Aggregate  intrinsic value  (in thousands)
Outstanding at December 31, 2011	17,252,879		$	38.45
Options granted	2,822,990		$	40.74
Options exercised	(1,634,494	)	$	17.82
Options forfeited	(385,309	)	$	44.75
Options canceled	(222,302	)	$	42.95
Outstanding at December 31, 2012	17,833,764		$	40.51	5.93	$	52,718
Exercisable at December 31, 2012	8,449,041		$	36.42	3.60	$	50,178

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:

	For the years ended December 31,
	2012			2011			2010
Dividend yield	1.30 - 1.35%			.97 - .98%			1.07 - 1.08%
Volatility – stock option plans	38 - 39%			38 - 40%			38 - 40%
Volatility – stock purchase rights plans	34		%	26		%	29		%
Risk-free interest rates	.19 - 1.43%			.19 - 2.84%			.29 - 2.86%
Expected life (years) – stock option plans	5.79 - 7.26			5.50 - 7.11			5.44 - 6.90
Expected life (years) – stock purchase rights plans	1			1			1
Weighted average fair value of stock options granted during the period	$	13.53		$	19.35		$	14.51
Weighted average fair value of stock purchase rights granted during the period	$	9.70		$	11.70		$	11.16

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

Total stock compensation expense and the total related tax benefit recognized are as follows:

	For the years ended December 31,
	2012		2011		2010
Stock compensation expense	$	44,058	$	44,278	$	43,743
Recognized tax benefit	$	2,016	$	156	$	187