FAIR VALUE MEASUREMENTS

We segregate the inputs used in measuring fair value into three levels: Level 1, defined as observable inputs such as quoted prices for identical assets or liabilities in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets that are not active; and Level 3, defined as unobservable inputs in which little or no market data exists. We consider counterparty credit risk and our own credit risk in the determination of all estimated fair values.

Recurring Fair Value Measurements

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



	June 30, 2014
	Level 1			Level 2			Level 3			Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	1,732		$	—		$	—		$	1,732
Commodity derivatives	—			3,767			—			3,767
Other long-term assets, net:
Commodity derivatives	—			256			—			256
Total	$	1,732		$	4,023		$	—		$	5,755
Liabilities:
Accrued liabilities:
Product imbalances	$	(878	)	$	—		$	—		$	(878	)
Commodity derivatives	(2,606		)	(1,151		)	—			(3,757		)
Contingent consideration	—			—			(1,318		)	(1,318		)
Other long-term liabilities:
Guarantee liability	—			—			(2,080		)	(2,080		)
Total	$	(3,484	)	$	(1,151	)	$	(3,398	)	$	(8,033	)



	December 31, 2013
	Level 1			Level 2			Level 3			Total
	(Thousands of Dollars)
Assets:
Other current assets:
Product imbalances	$	1,980		$	—		$	—		$	1,980
Commodity derivatives	—			4,948			—			4,948
Other long-term assets, net:
Commodity derivatives	—			6,977			—			6,977
Total	$	1,980		$	11,925		$	—		$	13,905
Liabilities:
Accrued liabilities:
Product imbalances	$	(2,190	)	$	—		$	—		$	(2,190	)
Commodity derivatives	(1,433		)	(800		)	—			(2,233		)
Contingent consideration	—			—			(1,318		)	(1,318		)
Other long-term liabilities:
Commodity derivatives	—			(1,575		)	—			(1,575		)
Guarantee liability	—			—			(1,880		)	(1,880		)
Total	$	(3,623	)	$	(2,375	)	$	(3,198	)	$	(9,196	)

Product Imbalances. We value our assets and liabilities related to product imbalances using quoted market prices in active markets as of the reporting date.

Commodity Derivatives. We base the fair value of certain of our commodity derivative instruments on quoted prices on an exchange; accordingly, we include these items in Level 1 of the fair value hierarchy. We also have derivative instruments for which we determine fair value using industry pricing services and other observable inputs, such as quoted prices on an exchange for similar derivative instruments. Therefore, we include these derivative instruments in Level 2 of the fair value hierarchy. See Note 7 for a discussion of our derivative instruments.

Contingent Consideration. On December 13, 2012, NuStar Logistics acquired certain assets from TexStar Midstream Services, LP and certain of its affiliates (collectively, TexStar) for approximately $325.0 million (the TexStar Asset Acquisition), including contingent consideration. In connection with the TexStar Asset Acquisition, we could be obligated to pay additional consideration to TexStar, depending upon the cost of work required to complete certain assets and obtain outstanding real estate rights (collectively, the Contingent Consideration). We estimated the fair value of the Contingent Consideration based on significant inputs not observable in the market and have therefore reported that amount within Level 3 of the fair value hierarchy. Based on our assessment of the costs necessary to complete the assets in accordance with our agreement with TexStar, and considering the probability of possible outcomes, we determined that it is unlikely we would be obligated to pay a portion of the Contingent Consideration. The undiscounted amount of potential future payments that we could be required to make under the applicable agreements is between $0 and $1.3 million.

Guarantees. As of June 30, 2014, we recorded a liability of $2.0 million representing the fair value of guarantees we have issued on behalf of Asphalt JV. We estimated the fair value considering the probability of default by Asphalt JV and an estimate of the amount we would be obligated to pay under the guarantees at the time of default. We calculated the fair value based on the guarantees outstanding as of June 30, 2014, totaling $88.3 million, plus two guarantees that do not specify a maximum amount, but for which we believe any amounts due would be minimal. Our estimate of the fair value is based on significant inputs not observable in the market and thus falls within Level 3 of the fair value hierarchy. See Note 8 for a discussion of our agreements with Asphalt JV.

In the event we are obligated to perform under any of these guarantees, the amount paid by us will be treated as additional borrowings under the NuStar JV Term Loan. As a result, we increased the carrying value of the note receivable from Asphalt JV by the same amount as the increase to the liability for the fair value of the guarantees outstanding as of June 30, 2014.

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



	Six Months Ended June 30, 2014
	(Thousands of Dollars)
Beginning balance	$	3,198
Adjustment to guarantee liability	200
Ending balance	$	3,398

Non-recurring Fair Value Measurements

We classified the property, plant and equipment associated with certain terminals as “Assets held for sale” on the consolidated balance sheet and recorded those assets at fair value, less costs to sell. We estimated the fair values of $6.4 million and $22.0 million as of June 30, 2014 and December 31, 2013, respectively, using a weighted-average of values calculated using an income approach and a market approach. The income approach calculates fair value by discounting the estimated net cash flows generated by the related terminal. The market approach involves estimating the fair value measurement on an earnings multiple based on public company transaction data. Our estimate of the fair value is based on significant inputs not observable in the market and thus falls within Level 3 of the fair value hierarchy.

Fair Value of Financial Instruments

We recognize cash equivalents, receivables, note receivables, payables and debt in our consolidated balance sheets at their carrying amounts. The fair values of these financial instruments, except for a note receivable from Asphalt JV and debt, approximate their carrying amounts. The estimated fair value and carrying amounts of the debt and note receivable were as follows:



	June 30, 2014				December 31, 2013
	Fair Value		Carrying Amount		Fair Value		Carrying Amount
	(Thousands of Dollars)
Debt	$	2,826,084	$	2,726,629	$	2,636,734	$	2,655,553
Note receivable from Asphalt JV	$	146,647	$	170,735	$	133,416	$	165,440

We estimated the fair value of our publicly-traded senior notes based upon quoted prices in active markets; therefore, we determined that the fair value of our publicly traded senior notes falls in Level 1 of the fair value hierarchy. For our other debt, for which a quoted market price is not available, we estimated the fair value using a discounted cash flow analysis using current incremental borrowing rates for similar types of borrowing arrangements and determined that the fair value falls in Level 2 of the fair value hierarchy.

The carrying amount of the NuStar JV Term Loan is $170.7 million, consisting of the following: (i) the outstanding principal amount of $190.0 million; (ii) plus the fair value of guarantees of $2.0 million as of June 30, 2014 (iii) less equity losses from our investment in Asphalt JV of $21.3 million incurred prior to the Asphalt JV Sale and after the carrying value of our equity investment in Asphalt JV was reduced to zero. We review the financial information of Asphalt JV monthly for possible non-payment indicators.

We estimated the fair value of the note receivable using discounted cash flows, which use observable inputs such as time to maturity and market interest rates, and determined the fair value falls in Level 2 of the fair value hierarchy. See Note 8 for additional information on the note receivable from Asphalt JV.