Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Share-based Compensation [Abstract]

Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value

The following table summarizes outstanding share options and exercisable options at March 31, 2012:

	Outstanding Options (1)			Exercisable Options (1)
Range of Exercise Prices	Number	Weighted Average Price		Number	Weighted Average Price
$30.06-$41.16	414,656	$	32.06	218,853	$	33.86
$42.90-$45.53	466,060	44.32		447,429	44.34
$48.02-$73.32	248,440	52.43		175,330	54.27
Total options	1,129,156	$	41.61	841,612	$	43.68

(1) The aggregate intrinsic value of outstanding and exercisable options at March 31, 2012 were $27.4 million and $18.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $65.75 per share on March 31, 2012 and the strike price of the underlying award.

Summary Of Share Incentive Plans

The following table summarizes activity under our share incentive plans for the three months ended March 31, 2012:

	Options Outstanding		Weighted Average Exercise  / Grant Price		Nonvested Share Awards Outstanding		Weighted Average Exercise / Grant Price
Total options and nonvested share awards outstanding at December 31, 2011	1,339,536		$	42.27	818,754		$	46.88
Granted	—		—		321,148		63.15
Exercised/vested	(180,650	)	43.12		(260,328	)	48.62
Forfeited	(29,730	)	62.32		(4,726	)	47.45
Net activity	(210,380	)			56,094
Total options and nonvested share awards outstanding at March 31, 2012	1,129,156		$	41.61	874,848		$	52.33