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RELATED PARTY TRANSACTIONS (Tables)
 9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The following table summarizes information pertaining to related party transactions:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(Thousands of Dollars)
Expenses for payroll, employee benefit plans and unit-based compensation
$
49,864

 
$
49,793

 
$
150,598

 
$
144,146

Other expenses
$
184

 
$
197

 
$
402

 
$
377