Basic and diluted net income per share are calculated by dividing net income by the number of basic and diluted weighted-average ordinary shares outstanding during the period. For the three and six months ended June 30, 2025 and 2024 the weighted-average ordinary shares outstanding used to calculate basic and diluted net income per share were as follows:


	For the three months ended		For the six months ended
	June 30, 2025	June 30, 2024	June 30, 2025	June 30, 2024
Basic weighted-average ordinary shares outstanding	146,209	150,845	147,354	150,663
Dilutive effect of stock options	—	8	—	4
Dilutive effect of unvested restricted securities	300	276	309	358
Diluted weighted-average ordinary shares outstanding	146,509	151,129	147,663	151,025

Net income and net income per share are presented in the condensed consolidated statements of operations.

Certain potential ordinary shares were excluded from our calculation of diluted weighted-average ordinary shares outstanding because either they would have had an anti-dilutive effect on net income per share or they related to equity awards that were contingently issuable for which the contingency had not been satisfied. These potential ordinary shares were as follows:


	For the three months ended		For the six months ended
	June 30, 2025	June 30, 2024	June 30, 2025	June 30, 2024
Anti-dilutive shares excluded	1,362	1,239	1,250	1,501
Contingently issuable shares excluded	1,014	929	854	995