Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Table Text Block Supplement [Abstract]

Calculation of Earnings Per Share

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2011		2010		2011		2010
BASIC
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,603		44,346		45,252		44,031
Net income attributable to common stockholders	$	9,957	$	21,162	$	47,622	$	52,767
Earnings per share attributable to common stockholders	$	0.22	$	0.48	$	1.05	$	1.20
DILUTED
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,603		44,346		45,252		44,031
Add: Assumed exercise of stock options and stock awards		1,490		1,327		1,623		1,387
		47,093		45,673		46,875		45,418
Net income attributable to common stockholders	$	9,957	$	21,162	$	47,622	$	52,767
Earnings per share attributable to common stockholders	$	0.21	$	0.46	$	1.02	$	1.16