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Earnings per share - Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 39,615	$ 60,108
Weighted average common shares outstanding for basic net income (loss) per share (shares)	135,027	137,658
Weighted average common shares outstanding for diluted net income (loss) per share (shares)	137,900	141,277
Earnings per share:
Basic (USD per share)	$ 0.29	$ 0.44
Diluted (USD per share)	$ 0.29	$ 0.43
Convertible Notes
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common stock outstanding (shares)	232	1,259
Stock options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common stock outstanding (shares)	2,173	2,043
RSUs, PSUs and ESPP
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common stock outstanding (shares)	468	317

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