Earnings per share - Basic and Diluted Income Per Common Share Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator
Net income	$ 444,091	$ 281,594	$ 202,129
Denominator
Weighted average common shares outstanding for basic earnings per share (in shares)	126,827	131,927	136,844
Dilutive potential common stock outstanding
Weighted average common shares outstanding for diluted net earnings per share (in shares)	129,424	134,197	140,608
Earnings per share
Earnings per share - basic (usd per share)	$ 3.50	$ 2.13	$ 1.48
Earnings per share - diluted (usd per share)	$ 3.43	$ 2.10	$ 1.44
Convertible Notes
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (in shares)	74	58	1,077
Stock options
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (in shares)	1,827	1,824	2,265
RSUs, PSUs and ESPP
Dilutive potential common stock outstanding
Dilutive potential common stock outstanding (in shares)	696	388	422

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