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EMPLOYEE BENEFITS - POSTRETIREMENT (Tables)
3 Months Ended
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Periodic Benefit Costs Charged to Operating Expenses
The net periodic benefit costs 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 March 31,
 
2018
 
2017
Warehousing, marketing and administrative expenses
 
 
 
Service cost
$
1,629

 
$
1,897

Other income (expense)
 
 
 
Interest cost
1,712

 
2,149

Expected return on assets
(3,315
)
 
(2,857
)
Amortization of unrecognized gains
(840
)
 
(655
)
Amortization of prior service credits
(2,424
)
 
(1,622
)
Net periodic benefit
$
(3,238
)
 
$
(1,088
)