Computation of Net Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Computation of Net Earnings per Share
Net income available to common stockholders	$ 61,579	$ 47,697	$ 44,189	$ 41,614	$ 109,276	$ 85,804
Weighted average shares of common stock outstanding used in computing basic income per share	32,775		33,096		32,759	33,170
Incremental options and RSUs	414		466		478	600
Weighted average shares of common stock used in computing diluted net income per share	33,189		33,562		33,237	33,770
Net income per share
Basic	$ 1.88		$ 1.34		$ 3.34	$ 2.59
Diluted	$ 1.86		$ 1.32		$ 3.29	$ 2.54
Anti-dilutive common equivalent shares excluded from calculation	770		15,796		387	8,255