Earnings per share - Basic and Diluted Income Per Common Share Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Numerator
Net income	$ 229,913	$ 165,160	$ 379,962	$ 283,255
Denominator
Basic (in shares)	117,274	121,343	117,707	122,274
Dilutive potential common stock outstanding
Weighted average common shares outstanding for diluted earnings per share (in shares)	121,215	124,158	122,092	125,452
Earnings per share
Basic (usd per share)	$ 1.96	$ 1.36	$ 3.23	$ 2.32
Diluted (usd per share)	$ 1.90	$ 1.33	$ 3.11	$ 2.26
Convertible Notes
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (in shares)	1,497	199	1,610	329
Stock options
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (in shares)	1,731	1,978	1,825	2,021
RSUs, PSUs and ESPP
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (in shares)	713	638	950	828

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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