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Earnings per share - Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net income	$ 81,837	$ 61,634	$ 196,206	$ 144,427
Denominator
Weighted average common shares outstanding for basic earnings per share (shares)	131,965	136,527	132,896	137,370
Dilutive potential common stock outstanding
Weighted average common shares outstanding for diluted earnings per share (shares)	134,083	139,387	135,233	141,019
Earnings per share
Basic (USD per share)	$ 0.62	$ 0.45	$ 1.48	$ 1.05
Diluted (USD per share)	$ 0.61	$ 0.44	$ 1.45	$ 1.02
Convertible Notes
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (shares)	0	260	77	1,076
Stock options
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (shares)	1,830	2,237	1,882	2,211
RSUs, PSUs and ESPP
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (shares)	288	363	378	362

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