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EMPLOYEE BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Periodic Benefit Costs Charged to Operating Expenses
The net periodic benefits for the Company's postretirement healthcare benefits plan which are valued at the measurement date of January 1 for each year and recognized evenly throughout the year, consisted of the following (in thousands of dollars):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Selling, general and administrative expenses
 
 
 
 
 
 
 
Service cost
$
1,629

 
$
1,897

 
$
3,258

 
$
3,794

Other income (expense)
 
 
 
 
 
 
 
Interest cost
1,712

 
2,148

 
3,424

 
4,297

Expected return on assets
(3,315
)
 
(2,857
)
 
(6,630
)
 
(5,714
)
Amortization of unrecognized gains
(840
)
 
(656
)
 
(1,680
)
 
(1,311
)
Amortization of prior service credits
(2,424
)
 
(1,622
)
 
(4,848
)
 
(3,244
)
Net periodic benefit
$
(3,238
)
 
$
(1,090
)
 
$
(6,476
)
 
$
(2,178
)