Computation of Net Earnings per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares
Computation of Net Earnings per Share
Net income available to common stockholders | $	$ 2,151	$ 6,101	$ 7,036	$ 13,852
Weighted average common shares outstanding used in computing basic earnings per share	29,221	28,700	29,118	28,480
Incremental options and RSUs	1,816	1,766	1,642	1,675
Weighted average common shares outstanding used in computing diluted net earnings per share	31,037	30,466	30,760	30,155
Net earnings per share
Basic | $ / shares	$ 0.07	$ 0.21	$ 0.24	$ 0.49
Diluted | $ / shares	$ 0.07	$ 0.20	$ 0.23	$ 0.46
Weighted Average Number Diluted Shares Outstanding Adjustment, Total	900	900	900	1,000
Common Stock
Computation of Net Earnings per Share
Reverse stock split conversion ratio			0.25