Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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, 2013:

	Outstanding Options (1)			Exercisable Options (1)
Range of Exercise Prices	Number	Weighted Average Price		Number	Weighted Average Price
$30.06-$41.16	240,713	$	32.98	142,808	$	34.98
$42.90-$43.94	108,947	43.43		108,947	43.43
$45.53-$62.32	323,697	47.44		323,697	47.44
Total options	673,357	$	41.62	575,452	$	43.59

(1) The aggregate intrinsic value of outstanding and exercisable options at March 31, 2013 was $18.2 million and $14.4 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $68.68 per share on March 31, 2013 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, 2013:

	Options Outstanding		Weighted Average Exercise Price		Nonvested Share Awards Outstanding		Weighted Average Grant  Price
Total options and nonvested share awards outstanding at December 31, 2012	838,754		$	42.36	862,253		$	52.64
Granted	—		—		330,695		69.41
Exercised/vested	(144,875	)	41.40		(282,626	)	50.02
Forfeited	(20,522	)	73.32		(2,634	)	54.69
Net activity	(165,397	)			45,435
Total options and nonvested share awards outstanding at March 31, 2013	673,357		$	41.62	907,688		$	59.56