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EMPLOYEE BENEFIT PLANS | 3 Months Ended
--- | ---
Mar. 31, 2022
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 March 31, |  |
| 2022 |  | 2021 |  |  |  |
| (unaudited) |  | (unaudited) |  |  |  |
Interest cost | $ | 422 |  |  | $ | 322 |  |  |  |  |
Expected return on plan assets | (629) |  |  | (504) |  |  |  |  |
Amortization of prior service cost | 8 |  |  | 9 |  |  |  |  |
Net periodic pension credit | $ | (199) |  |  | $ | (173) |  |  |  |  |
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 $3.9 million to the U.K. Plan for 2022, of which $1.0 million has been contributed through March 31, 2022.

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