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

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

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

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:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands, except per share amounts)	2017		2016		2017		2016
Numerator (basic and diluted):
Net income allocated to common shareholders for basic calculation	$	45,982	$	37,191	$	36,325	$	40,949
Denominator:
Weighted average common shares outstanding, basic	39,844		39,599		39,774		39,539
Dilutive effect of common stock options and restricted stock units	543		714		593		666
Weighted average common shares outstanding, diluted	40,387		40,313		40,367		40,205
Net income per share, basic	$	1.15	$	0.94	$	0.91	$	1.04
Net income per share, diluted	$	1.14	$	0.92	$	0.90	$	1.02