Earnings Per Share - (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table sets forth the weighted average number of stock options and restricted stock units that have been excluded from the calculation of diluted earnings per share as their effect would have been antidilutive:

	Three Months Ended June 30,		Six Months Ended June 30,
	2017	2016	2017	2016
Stock options	—	4	—	78
Restricted stock units	1	—	13	—
Total	1	4	13	78

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

The Company’s basic and diluted earnings per share amounts are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Numerator:
Net income	$	9,193	$	7,601	$	16,344	$	21,540
Denominator:
Basic earnings per share - weighted average shares outstanding	31,501		30,779		31,397		30,869
Effect of potential dilutive securities:
Employee stock options and restricted stock units - dilutive shares	645		563		704		630
Convertible senior notes - dilutive shares	—		412		—		206
Warrant - dilutive shares	—		—		3		—
Diluted earnings per share - weighted average shares outstanding	32,146		31,754		32,104		31,705
Earnings per share:
Basic	$	0.29	$	0.25	$	0.52	$	0.70
Diluted	$	0.29	$	0.24	$	0.51	$	0.68