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Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Notes to Financial Statements [Abstract]

Stock Based Compensation Expense

		Three months ended March 31,
		2012				2011
Stock based compensation		$	9,954			$	8,112
Tax effect recognized in net income			3,484				2,839
Windfall tax benefit, net			7,415				2,791

Weighted average assumptions used to value option grants

	Three months ended March 31,
	2012		2011
Fair value per share ($)	29.65		24.86
Risk-free interest rate (%)	0.82		2.07
Expected option life (years)	5.22		5.33
Expected volatility (%)	36.56		35.17
Expected dividend yield (%)	0.59		0.59

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- Definition

Disclosure of compensation-related costs for share-based compensation which may include disclosure of policies, compensation plan details, allocation of stock compensation, incentive distributions, share-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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- Definition

This table provides the weighted average assumptions used to estimate the fair value of options granted during the current and prior periods using the Black-Scholes Option pricing model.

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