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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Cost (Credit)
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
)