Net Income Per Share: (Tables)

9 Months Ended

Sep. 30, 2011

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,
	2011		2010		2011		2010
Net income	$	9,261	$	8,975	$	26,827	$	20,943
Weighted average number of common shares outstanding (for basic calculation)	13,932		13,489		13,826		13,605
Dilutive securities	252		263		343		233
Weighted average common and common equivalent shares outstanding (for diluted calculation)	14,184		13,752		14,169		13,838
EPS — basic	$	0.66	$	0.67	$	1.94	$	1.54
EPS — diluted	$	0.65	$	0.65	$	1.89	$	1.51