Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012


	Shares			Outstanding Weighted- Average Exercise Price		Aggregate Intrinsic Value		Weighted- Average Remaining Contractual Life
Outstanding at December 31, 2011		746		$	43.47
Granted		205		$	71.28
Exercised		(55	)	$	32.43
Forfeited		(2	)	$	64.00
Expired or canceled		—		$	—

Outstanding at March 31, 2012		894		$	50.47	$	15,121		4.8 years
Exercisable at March 31, 2012		508		$	37.09	$	13,841		3.6 years

Schedule Of Weighted-Average Valuation Assumptions


	Three Months Ended March 31,
	2012			2011
Assumptions:
Risk-free interest rate		0.7	%		2.0	%
Dividend yield		0.3	%		0.3	%
Volatility factor		47			44
Expected life (in years)		4.1			4.4

Schedule Of Restricted Share Award Activity


	Shares			Weighted- Average Grant- Date Fair Value (per share)
Nonvested at December 31, 2011		148		$	48.59
Granted		42		$	71.28
Vested		(37	)	$	18.53
Forfeited		(8	)	$	84.56

Nonvested at March 31, 2012		145		$	60.66

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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