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Fair Value Measurements
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements

The fair values of financial instruments are estimated based upon current market conditions and quoted market prices for the same or similar instruments. Management estimates that the carrying value approximates fair value for all of our assets and liabilities that fall under the scope of ASC 825, Financial Instruments.

We apply the provisions of ASC 820, Fair Value Measurements, which defines fair value, establishes a framework for its measurement and expands disclosures about fair value measurements. ASC 820 applies to commodity and interest rate derivatives that are measured at fair value on a recurring basis. The standard also requires that we assess the impact of nonperformance risk on our derivatives. Nonperformance risk is not considered material to our financial statements at this time.

ASC 820 requires disclosures that categorize assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included within Level 1 for the asset or liability, either directly or indirectly through market-corroborated inputs. Level 3 inputs are unobservable inputs for the asset or liability reflecting our assumptions about pricing by market participants.

Commodity swaps, exchange-traded futures, physical commodity forward purchase and sale contracts and any interest rate swaps are generally valued using industry-standard models that consider various assumptions, including quoted forward prices, spot prices, interest rates, time value, volatility factors and contractual prices for the underlying instruments, as well as other relevant economic measures. The degree to which these inputs are observable in the forward markets determines the classification as Level 2 or 3. Our contracts are valued based on exchange pricing and/or price index developers such as Platts or Argus and are, therefore, classified as Level 2.
The fair value hierarchy for our financial assets and liabilities accounted for at fair value on a recurring basis at June 30, 2018 and December 31, 2017 was as follows (in thousands):

 
 
As of June 30, 2018
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
—

 
$
2

 
$
—

 
$
2

     Total assets
 
—

 
2

 
—

 
2

Liabilities
 
 
 
 
 
 
 


Commodity derivatives
 
—

 
(380
)
 
—

 
(380
)
Net liabilities
 
$
—

 
$
(378
)
 
$
—

 
$
(378
)
 
 
As of December 31, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Liabilities
 
 
 
 
 
 
 
 
Commodity derivatives
 
—

 
(1,087
)
 
—

 
(1,087
)
Net liabilities
 
$
—

 
$
(1,087
)
 
$
—

 
$
(1,087
)


The derivative values above are based on analysis of each contract as the fundamental unit of account as required by ASC 820. In the table above, derivative assets and liabilities with the same counterparty are not netted where the legal right of offset exists. This differs from the presentation in the financial statements which reflects our policy, wherein we have elected to offset the fair value amounts recognized for multiple derivative instruments executed with the same counterparty and where the legal right of offset exists.

As of June 30, 2018 and December 31, 2017, we had cash collateral of $0.5 million and $0.3 million, respectively, netted with the net derivative position of our counterparty. See Note 14 for further information regarding derivative instruments.