RELATED PARTY TRANSACTIONS (Tables)

12 Months Ended

Dec. 31, 2012

Related Party Transactions [Abstract]

Schedule of total related party transactions

	Year Ended December 31,
	2012		2011		2010
	(Thousands of Dollars)
Expenses for payroll, employee benefit plans and unit-based compensation	$	225,135	$	216,380	$	208,805
Other expenses	$	437	$	402	$	383