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RELATED PARTY TRANSACTIONS (Tables)
 9 Months Ended
Sep. 30, 2014
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes information pertaining to related party transactions: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(Thousands of Dollars)
Expenses for payroll, employee benefit plans and unit-
     based compensation
$
49,793

 
$
42,736

 
$
144,146

 
$
141,933

Other expenses
$
197

 
$
167

 
$
377

 
$
344