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EMPLOYEE BENEFITS - POSTRETIREMENT (Tables)
9 Months Ended
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Periodic Benefit Costs Charged to Operating Expenses
The net periodic (benefits) costs recorded in Warehousing, marketing and administrative expenses consisted of the following components (in thousands of dollars):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
1,856

 
$
2,059

 
$
5,649

 
$
6,178

Interest cost
2,026

 
2,464

 
6,323

 
7,391

Expected return on assets
(2,957
)
 
(2,528
)
 
(8,670
)
 
(7,584
)
Amortization of unrecognized (gains) losses
(609
)
 
32

 
(1,919
)
 
96

Amortization of prior service credits
(1,893
)
 
(1,672
)
 
(5,139
)
 
(5,016
)
Net periodic (benefits) costs
$
(1,577
)
 
$
355

 
$
(3,756
)
 
$
1,065