Net Income Per Share: (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

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

The following table presents the calculation of net earnings per common share (“EPS”) — basic and diluted.

	Three months ended September 30,				Nine months ended September 30,
	2012		2011		2012		2011
Net income	$	12,188	$	9,261	$	28,938	$	26,827
Weighted average number of common shares outstanding (for basic calculation)	14,321		13,932		14,153		13,826
Dilutive securities	505		252		460		343
Weighted average common and common equivalent shares outstanding (for diluted calculation)	14,826		14,184		14,613		14,169
EPS — basic	$	0.85	$	0.66	$	2.04	$	1.94
EPS — diluted	$	0.82	$	0.65	$	1.98	$	1.89