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Computation of Net Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Computation of Net Earnings per Share
Net income available to common stockholders	$ 16,480	$ 11,221
Weighted average common shares outstanding used in computing basic income per share	33,715	32,872
Incremental options and RSUs	928	1,185
Weighted average common shares used in computing diluted net income per share	34,643	34,057
Net income per share
Basic	$ 0.49	$ 0.34
Diluted	$ 0.48	$ 0.33
Anti-dilutive common equivalent shares excluded from calculation	1,429	1,675

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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