Net Income Per Share: (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31,
	2013		2012
Net income	$	8,685	$	7,601
Weighted average number of common shares outstanding (for basic calculation)	14,507		13,956
Dilutive securities	546		362
Weighted average common and common equivalent shares outstanding (for diluted calculation)	15,053		14,318
EPS — basic	$	0.60	$	0.54
EPS — diluted	$	0.58	$	0.53