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Defined Benefit Pension Plans | 9 Months Ended
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Sep. 30, 2021
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 and nine months ended September 30, 2021 and 2020 included the following components:
|  | Three Months Ended |  |  | Nine Months Ended |
(in thousands) |  | September 30, 2021 |  |  | September 30, 2020 |  |  | September 30, 2021 |  |  | September 30, 2020 |
Service cost |  | $ | 302 |  |  | $ | 315 |  |  | $ | 921 |  |  | $ | 946 |
Interest cost |  |  | 2,858 |  |  |  | 4,092 |  |  |  | 8,533 |  |  |  | 12,330 |
Expected return on assets |  |  | (6,348 | ) |  |  | (6,936 | ) |  |  | (18,968 | ) |  |  | (20,899 | )
Amortization of actuarial loss |  |  | 2,589 |  |  |  | 2,614 |  |  |  | 7,760 |  |  |  | 7,848 |
Net periodic (benefit) cost |  | $ | (599 | ) |  | $ | 85 |  |  | $ | (1,754 | ) |  | $ | 225 |
For the three months ended September 30, 2021 and 2020, the non-service components of net periodic pension benefit of $(901,000) and $(230,000), respectively, are included in "Other Income (Expense), net" on the unaudited Condensed Consolidated Statement of Operations. For the nine months ended September 30, 2021 and 2020, the non-service components of net periodic pension benefit of $(2,675,000) and $(721,000), respectively, are included in "Other Income (Expense), net" on the unaudited Condensed Consolidated Statement of Operations. For the nine months ended September 30, 2021, the Company made contribution of $9,000,000 to the U.S. defined benefit pension plan and $526,000 to the U.K. defined benefit pension plans, respectively, as compared with $3,000,000 to the U.S. defined benefit pension plan and $455,000 to the U.K. defined benefit pension plans during the nine months ended September 30, 2020.

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