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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Pension Cost (Credit)
Net periodic pension cost (credit) for the U.K. and Norwegian Plans includes the following components (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(unaudited)
 
(unaudited)
 
(unaudited)
 
(unaudited)
Service cost
$
4

 
$
22

 
$
8

 
$
29

Interest cost
597

 
801

 
1,176

 
1,068

Expected return on plan assets
(761
)
 
(820
)
 
(1,499
)
 
(1,093
)
Amortization of net actuarial loss
17

 
—

 
34

 
—

Net periodic pension cost (credit)
$
(143
)
 
$
3

 
$
(281
)
 
$
4