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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2020
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 June 30,Six Months Ended June 30,
 2020201920202019
(unaudited)(unaudited)(unaudited)(unaudited)
Interest cost426  586  867  $1,179  
Expected return on plan assets(558) (600) (1,135) $(1,207) 
Amortization of prior service cost8  8  16  $16  
Net periodic pension credit$(124) $(6) $(252) $(12) 

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: 2.90% overall, 5.30% for equities and 2.10% for debt securities.
We expect to contribute $3.7 million to the U.K. Plan for 2020, of which $1.9 million has been contributed through June 30, 2020.