Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

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

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
BASIC
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,997		45,603		45,702		45,252
Net income attributable to common stockholders	$	8,553	$	9,957	$	20,077	$	47,622
Earnings per share attributable to common stockholders	$	0.19	$	0.22	$	0.44	$	1.05
DILUTED
Weighted average number of common shares outstanding
used in computing basic earnings per share		45,997		45,603		45,702		45,252
Add: Assumed exercise of stock options and stock awards		998		1,490		1,199		1,623
		46,995		47,093		46,901		46,875
Net income attributable to common stockholders	$	8,553	$	9,957	$	20,077	$	47,622
Earnings per share attributable to common stockholders	$	0.18	$	0.21	$	0.43	$	1.02