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EMPLOYEE BENEFIT PLANS | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS We have a defined benefit pension plan covering certain United Kingdom employees (the “U.K. Plan”). Net periodic pension credit includes the following components (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (unaudited) |  | (unaudited) |  | (unaudited) |  | (unaudited)
Interest cost | $ | 322 |  |  | $ | 443 |  |  | 970 |  |  | $ | 1,310 |
Expected return on plan assets | (504) |  |  | (580) |  |  | (1,515) |  |  | $ | (1,715) |
Amortization of prior service cost | 9 |  |  | 8 |  |  | 26 |  |  | $ | 24 |
Net periodic pension credit | $ | (173) |  |  | $ | (129) |  |  | $ | (519) |  |  | $ | (381) |
The expected long-term rate of return on invested assets is determined based on the weighted average of expected returns on asset investment categories for the U.K. Plan as follows: 2.1% overall, 4.6% for equities and 1.4% for debt securities. We expect to contribute $4.1 million to the U.K. Plan for 2021, of which $3.1 million has been contributed through September 30, 2021.

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