Weighted Average Shares Outstanding and Net Income (Loss) Per Share (Notes)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Weighted Average Shares Outstanding and Net Income Per Share

The following table presents a reconciliation of the weighted average shares outstanding used in calculating basic and diluted net income per share as well as the calculation of basic and diluted net income per share (in thousands except per share amounts):

Years Ended December 31,	2017		2016		2015
Numerator (basic and diluted):
Net income allocated to common shareholders for basic calculation	$	69,098	$	57,122	$	60,485
Denominator:
Weighted average common shares outstanding, basic	39,795		39,557		39,337
Dilutive effect of stock options and restricted stock units	577		668		531
Weighted average common shares outstanding, diluted	40,372		40,225		39,868
Net income per share, basic	$	1.74	$	1.44	$	1.54
Net income per share, diluted	$	1.71	$	1.42	$	1.52