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EMPLOYEE BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2013
Notes Tables [Abstract]  
Net Periodic Benefit Costs Charged to Operating Expenses
The net periodic benefit costs charged to operating expenses, which are valued at the measurement date of January 1 and recognized evenly throughout the year, consisted of the following components (in thousands of dollars):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Service cost
$
2,567

 
$
5,015

 
$
5,294

 
$
10,029

Interest cost
2,119

 
3,203

 
4,469

 
6,405

Expected return on assets
(1,769
)
 
(1,553
)
 
(3,538
)
 
(3,106
)
Amortization of transition asset
(36
)
 
(36
)
 
(71
)
 
(71
)
Amortization of unrecognized losses
746

 
1,207

 
1,862

 
2,414

Amortization of prior service credits
(1,852
)
 
(124
)
 
(3,705
)
 
(248
)
Net periodic benefit costs
$
1,775

 
$
7,712

 
$
4,311

 
$
15,423