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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(unaudited)
 
(unaudited)
 
(unaudited)
 
(unaudited)
Service cost
$
23

 
$
4

 
$
70

 
$
12

Interest cost
563

 
610

 
1,752

 
1,786

Expected return on plan assets
(909
)
 
(780
)
 
(2,827
)
 
(2,279
)
Amortization of net actuarial loss
—

 
19

 
—

 
53

Net periodic pension credit
$
(323
)
 
$
(147
)
 
$
(1,005
)
 
$
(428
)