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RELATED PARTY TRANSACTIONS (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(Thousands of Dollars)
Expenses for payroll, employee benefit plans and unit-
     based compensation
$
50,016

 
$
46,292

 
$
94,353

 
$
99,197

Other expenses
$
86

 
$
84

 
$
180

 
$
177