Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Table Text Block Supplement [Abstract]

Calculation of Earnings Per Share

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2011		2010		2011		2010
BASIC
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,325		43,975		45,074		43,871
Net income attributable to common stockholders	$	17,981	$	16,647	$	37,665	$	31,605
Earnings per share attributable to common stockholders	$	0.40	$	0.38	$	0.84	$	0.72
DILUTED
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,325		43,975		45,074		43,871
Add: Assumed exercise of stock options and stock awards		1,823		1,535		1,763		1,487
		47,148		45,510		46,837		45,358
Net income attributable to common stockholders	$	17,981	$	16,647	$	37,665	$	31,605
Earnings per share attributable to common stockholders	$	0.38	$	0.37	$	0.80	$	0.70