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EMPLOYEE BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Cost (Credit)
Net periodic pension credit for the U.K. and Norwegian Plans includes the following components (in thousands):
 
Three Months Ended March 31,
 
2018
 
2017
 
(unaudited)
 
(unaudited)
Service cost
$
24

 
$
4

Interest cost
601

 
579

Expected return on plan assets
(970
)
 
(738
)
Amortization of net actuarial loss

 
17

Net periodic pension credit
$
(345
)
 
$
(138
)