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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2019
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”). In connection with the sale of the Company’s Norwegian operations in 2018, all assets and liabilities associated with the defined benefit pension plan covering certain Norwegian employees (the “Norwegian Plan”) were transferred to the buyer. The schedule of net periodic pension credit includes only the U.K. Plan in 2019 and combined amounts from the Norwegian and U.K. Plans in 2018.
Net periodic pension credit includes the following components (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
(unaudited)
 
(unaudited)
 
(unaudited)
 
(unaudited)
Service cost
$
—

 
$
23

 
$
—

 
$
47

Interest cost
586

 
588

 
1,179

 
1,189

Expected return on plan assets
(600
)
 
(948
)
 
(1,207
)
 
(1,918
)
Amortization of unrecognized prior service cost
8

 
—

 
16

 
—

Net periodic pension credit
$
(6
)
 
$
(337
)
 
$
(12
)
 
$
(682
)


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: 3.25% overall, 5.77% for equities and 2.66% for debt securities. We expect to contribute $2.3 million to the U.K. Plan for 2019, of which $1.2 million has been contributed through June 30, 2019.