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EMPLOYEE BENEFIT PLANS
 9 Months Ended
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,
 2021202020212020
(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 cost9 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.