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Defined Benefit Pension Plans | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Defined Benefit Pension Plans | 6. Defined Benefit Pension Plans Net periodic cost related to all of the Company's defined benefit pension plans recognized in the Company's unaudited Condensed Consolidated Statements of Operations for the three months ended March 31, 2024 and 2023 included the following components:
|  | Three Months Ended |
(in thousands) |  | March 31, 2024 |  |  | March 31, 2023 |
Service cost |  | $ | 384 |  |  | $ | 357 |
Interest cost |  |  | 5,746 |  |  |  | 5,939 |
Expected return on assets |  |  | (6,409 | ) |  |  | (6,773 | )
Amortization of actuarial loss |  |  | 3,186 |  |  |  | 2,978 |
Net periodic cost |  | $ | 2,907 |  |  | $ | 2,502 |
For the three months ended March 31, 2024 and 2023, the non-service components of net periodic pension expense of $2,523,000 and $2,145,000, respectively, are included in "Other Loss, net" on the unaudited Condensed Consolidated Statements of Operations. For the three months ended March 31, 2024, the Company made no contributions to the U.S. defined benefit pension plan and $602,000 to the U.K. defined benefit pension plans, as compared with no contributions to the U.S. defined benefit pension plan and $502,000 to the U.K. defined benefit pension plans during the three months ended March 31, 2023.

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