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Defined Benefit Pension Plan
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Defined Benefit Pension Plan
Defined Benefit Pension Plan
We sponsor a defined benefit pension plan in the U.K. (the "U.K. Pension Plan"), which was closed to future service cost accruals on April 30, 2016. For the three months ended March 31, 2018 and 2017, the components of the net pension credit for the U.K. Pension Plan recorded within Non-Operating Income in our Condensed Consolidated Statements of Operations were as follows (in thousands of dollars):
 
 
Three Months Ended March 31,
 
 
2018
 
2017
Interest cost
 
$
1,981

 
$
1,938

Expected return on plan assets
 
(2,902
)
 
(3,407
)
Prior service cost
 
—

 
15

Amortization of actuarial loss
 
125

 
273

Amortization of prior service cost
 
(26
)
 
(23
)
Net pension credit
 
$
(822
)
 
$
(1,204
)