FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

The following assets and liabilities are measured at fair value on a recurring basis:



	June 30, 2016
	Level 1				Level 2				Level 3				Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	142			$	—			$	—			$	142
Commodity derivatives	—				224				—				224
Total	$	142			$	224			$	—			$	366
Liabilities:
Accrued liabilities:
Product imbalances	$	(407	)		$	—			$	—			$	(407	)
Commodity derivatives	(4,860		)		(238		)		—				(5,098		)
Other long-term liabilities:
Guarantee liability	—				—				(1,805		)		(1,805		)
Interest rate swaps	—				(48,875		)		—				(48,875		)
Total	$	(5,267	)		$	(49,113	)		$	(1,805	)		$	(56,185	)



	December 31, 2015
	Level 1				Level 2				Level 3				Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	179			$	—			$	—			$	179
Commodity derivatives	11,325				77				—				11,402
Other long-term assets, net:
Interest rate swaps	—				2,755				—				2,755
Total	$	11,504			$	2,832			$	—			$	14,336
Liabilities:
Accrued liabilities:
Product imbalances	$	(419	)		$	—			$	—			$	(419	)
Commodity derivatives	—				(120		)		—				(120		)
Other long-term liabilities:
Guarantee liability	—				—				(1,697		)		(1,697		)
Interest rate swaps	—				(1,452		)		—				(1,452		)
Total	$	(419	)		$	(1,572	)		$	(1,697	)		$	(3,688	)

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table summarizes the activity in our Level 3 liabilities:



	Six Months Ended June 30, 2016
	(Thousands of Dollars)
Beginning balance	$	1,697
Adjustments to guarantee liability	108
Ending balance	$	1,805

Fair Value and Carrying Value of Debt and Note Receivable [Table Text Block]

The estimated fair values and carrying amounts of the long-term debt and the Axeon Term Loan were as follows:



	June 30, 2016								December 31, 2015
	Fair Value				Carrying Amount				Fair Value				Carrying Amount
	(Thousands of Dollars)
Long-term debt	$	3,204,542			$	3,205,693			$	2,929,438			$	3,055,612
Axeon Term Loan	$	174,397			$	170,460			$	172,123			$	170,352