Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2013		2012		2013		2012
BASIC
Weighted average number of common shares outstanding
used in computing basic earnings per share		46,148		45,642		46,085		45,551
Net income attributable to common stockholders	$	8,635	$	6,653	$	6,709	$	11,524
Earnings per share attributable to common stockholders	$	0.19	$	0.15	$	0.15	$	0.25
DILUTED
Weighted average number of common shares outstanding
used in computing basic earnings per share		46,148		45,642		46,085		45,551
Add: Assumed exercise of stock options and stock awards		1,359		1,217		1,298		1,365
		47,507		46,859		47,383		46,916
Net income attributable to common stockholders	$	8,635	$	6,653	$	6,709	$	11,524
Earnings per share attributable to common stockholders	$	0.18	$	0.14	$	0.14	$	0.25