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RELATED PARTY TRANSACTIONS (Tables)
 3 Months Ended
Mar. 31, 2015
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The following table summarizes information pertaining to related party transactions: 
 
Three Months Ended March 31,
 
2015
 
2014
 
(Thousands of Dollars)
Expenses for payroll, employee benefit plans and unit-based compensation
$
48,546

 
$
44,337

Other expenses
$
129

 
$
94