Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Earnings Per Share

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Net income	$	26,136	$	3,416	$	60,909	$	34,814
Shares for basic and diluted calculation:
Average shares used in basic computation		53,569		52,932		53,406		52,734
Dilutive effect of stock options and units		9,109		10,313		9,294		10,505
Average shares used in dilutive computation:		62,678		63,245		62,700		63,239
Net income per share:
Basic	$	0.49	$	0.06	$	1.14	$	0.66
Diluted	$	0.42	$	0.05	$	0.97	$	0.55

⁽¹⁾Diluted earnings per share is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units.