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Defined Benefit Pension Plans | 3 Months Ended
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Mar. 31, 2022
Retirement Benefits [Abstract] |
Defined Benefit Pension Plans | 6. Defined Benefit Pension Plans Net periodic benefit 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, 2022 and 2021 included the following components:
|  | Three Months Ended |
(in thousands) |  | March 31, 2022 |  |  | March 31, 2021 |
Service cost |  | $ | 345 |  |  | $ | 303 |
Interest cost |  |  | 3,394 |  |  |  | 2,818 |
Expected return on assets |  |  | (6,419 | ) |  |  | (6,270 | )
Amortization of actuarial loss |  |  | 2,527 |  |  |  | 2,642 |
Net periodic benefit |  | $ | (153 | ) |  | $ | (507 | )
For the three months ended March 31, 2022 and 2021, the non-service components of net periodic pension benefit of $498,000 and $(810,000), respectively, are included in "Other Income, net" on the unaudited Condensed Consolidated Statement of Operations. For the three months ended March 31, 2022, the Company made no contributions to the U.S. defined benefit pension plan and $160,000 to the U.K. defined benefit pension plans, respectively, as compared with no contributions to the U.S. defined benefit pension plan and $157,000 to the U.K. defined benefit pension plans during the three months ended March 31, 2021.

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