Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2012		2011		2012		2011
BASIC
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,642		45,325		45,551		45,074
Net income attributable to common stockholders	$	6,653	$	17,981	$	11,524	$	37,665
Earnings per share attributable to common stockholders	$	0.15	$	0.40	$	0.25	$	0.84
DILUTED
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,642		45,325		45,551		45,074
Add: Assumed exercise of stock options and stock awards		1,217		1,823		1,365		1,763
		46,859		47,148		46,916		46,837
Net income attributable to common stockholders	$	6,653	$	17,981	$	11,524	$	37,665
Earnings per share attributable to common stockholders	$	0.14	$	0.38	$	0.25	$	0.80