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SHORT-TERM DEBT (Tables)
12 Months Ended
Dec. 31, 2016
Short-term Debt [Abstract]  
Schedule of Short-term Debt
Short-term debt consisted of the following (in thousands of dollars):

 
As of December 31,
 
2016
 
2015
Lines of Credit
 
 
 
Outstanding at December 31
$
16,392

 
$
23,072

Maximum month-end balance during the year
$
24,722

 
$
47,802

Weighted average interest rate during the year
4.04
%
 
4.37
%
Weighted average interest rate at December 31
5.13
%
 
3.16
%
 
 
 
 
Commercial Paper
 
 
 
Outstanding at December 31
$
369,748

 
$
330,000

Maximum month-end balance during the year
$
629,712

 
$
330,000

Weighted average interest rate during the year
0.50
%
 
0.23
%
Weighted average interest rate at December 31
0.69
%
 
0.47
%