Computation of Net Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Computation of Net Earnings per Share
Net income available to common stockholders	$ 44,189	$ 41,614	$ 18,906	$ 16,480	$ 85,804	$ 35,386
Weighted average common shares outstanding used in computing basic income per share	33,096		33,677		33,170	33,696
Incremental options and RSUs	466		634		600	777
Weighted average common shares used in computing diluted net income per share	33,562		34,311		33,770	34,473
Net income per share
Basic	$ 1.34		$ 0.56		$ 2.59	$ 1.05
Diluted	$ 1.32		$ 0.55		$ 2.54	$ 1.03
Anti-dilutive common equivalent shares excluded from calculation	15,796		1,800		8,255	1,352