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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,
 20222021
(unaudited)(unaudited)
Interest cost$422 $322 
Expected return on plan assets(629)(504)
Amortization of prior service cost8 9 
Net periodic pension credit$(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.