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SHORT-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2015
Short-term Debt [Line Items]  
Schedule of Short-term Debt
The following summarizes information concerning short-term debt (in thousands of dollars):

 
As of December 31,
 
2015
 
2014
Lines of Credit
 
 
 
Outstanding at December 31
$
23,072

 
$
51,896

Maximum month-end balance during the year
$
47,802

 
$
64,384

Weighted average interest rate during the year
4.37
%
 
4.16
%
Weighted average interest rate at December 31
3.16
%
 
3.69
%
 
 
 
 
Commercial Paper
 
 
 
Outstanding at December 31
$
330,000

 
$
5,000

Maximum month-end balance during the year
$
330,000

 
$
54,997

Weighted average interest rate during the year
0.23
%
 
0.16
%
Weighted average interest rate at December 31
0.47
%
 
0.17
%