Computation of Net Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Computation of Net Earnings per Share
Net income available to common stockholders	$ 11,221	$ 6,062
Weighted average common shares outstanding used in computing basic income per share	32,872,000	32,683,000
Incremental options and RSUs	1,185,000	1,541,000
Weighted average common shares used in computing diluted net income per share	34,057,000	34,224,000
Net income per share
Basic	$ 0.34	$ 0.19
Diluted	$ 0.33	$ 0.18
Weighted average number diluted shares outstanding adjustment	1,675	9,213