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Benefit Plans
 12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
We maintain a contributory defined contribution 401(k) plan for our U.S. employees, where company-matched contributions are fully vested. Additional contributory plans are in effect internationally, including in the U.K. and Ireland. Contribution expense for such plans was $10.3 million, $9.7 million and $7.6 million in 2023, 2022 and 2021, respectively.