Computation of Net Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Computation of Net Earnings per Share
Net income available to common stockholders	$ 40,283	$ 44,189	$ 41,614	$ 27,515	$ 18,906	$ 16,480	$ 126,087	$ 62,901
Weighted average common shares outstanding used in computing basic income per share	33,011			33,537			33,116	33,643
Incremental options and RSUs	378			552			522	696
Weighted average common shares used in computing diluted net income per share	33,389			34,089			33,638	34,339
Net income per share
Basic	$ 1.22			$ 0.82			$ 3.81	$ 1.87
Diluted	$ 1.21			$ 0.81			$ 3.75	$ 1.83
Anti-dilutive common equivalent shares excluded from calculation	5,046			347			6,692	413