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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 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 March 31,
 20212020
(unaudited)(unaudited)
Interest cost$322 $441 
Expected return on plan assets(503)(578)
Amortization of prior service cost9 8 
Net periodic pension credit$(173)$(129)

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 $1.0 million has been contributed through March 31, 2021.