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Fair-Value Measurements
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair-Value Measurements Fair-Value Measurements
We classify financial assets and liabilities into the following three levels based on the inputs used to measure fair value:
(1)Level 1 fair values are based on observable inputs such as quoted prices in active markets for identical assets and liabilities;
(2)Level 2 fair values are based on pricing inputs other than quoted prices in active markets for identical assets and liabilities and are either directly or indirectly observable as of the measurement date; and
(3)Level 3 fair values are based on unobservable inputs in which little or no market data exists.
    As required by fair value accounting guidance, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
Our assessment of the significance of a particular input to the fair value requires judgment and may affect the placement of assets and liabilities within the fair value hierarchy levels.
The following table sets forth by level within the fair value hierarchy our financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2021 and December 31, 2020. 
 Fair Value atFair Value at
March 31, 2021December 31, 2020
Recurring Fair Value MeasuresLevel 1Level 2Level 3Level 1Level 2Level 3
Commodity derivatives:
Assets$913 $127 $— $1,754 $616 $— 
Liabilities$(1,397)$— $— $(5,459)$— $— 
Preferred Distribution Rate Reset Election$— $— $(70,810)$— $— $(52,372)

Rollforward of Level 3 Fair Value Measurements

    The following table provides a reconciliation of changes in fair value at the beginning and ending balances for our derivatives classified as level 3:
 Three Months Ended
March 31,
2021
Balance as of December 31, 2020$(52,372)
Unrealized loss for the period included in earnings(18,438)
Balance as of March 31, 2021$(70,810)

Our commodity derivatives include exchange-traded futures and exchange-traded options contracts. The fair value of these exchange-traded derivative contracts is based on unadjusted quoted prices in active markets and is, therefore, included in Level 1 of the fair value hierarchy. The fair value of the swaps contracts was determined using market price quotations and a pricing model. The swap contracts were considered a level 2 input in the fair value hierarchy at March 31, 2021.
The fair value of the embedded derivative feature is based on a valuation model that estimates the fair value of our Class A Convertible Preferred Units with and without a Rate Reset Election. This model contains inputs, including our common unit price relative to the issuance price, the current dividend yield, credit spread, default probabilities, equity volatility and timing estimates which involve management judgment. Our equity volatility rate used to value our embedded derivative feature was 50% at March 31, 2021. A significant increase or decrease in the value of these inputs could result in a material change in fair value to this embedded derivative feature. Due to a decrease in our discount yield compared to the preceding quarter, as well as the passage of time as we draw nearer to our coupon rate reset date in 2022, we recorded an unrealized loss of $18.4 million for the 2021 Quarter. During the 2020 Quarter, we recorded an unrealized gain of $32.5 million due to the significant changes in the energy industry credit markets and our common unit price during the period. The unrealized loss in the 2021 Quarter and the unrealized gain in the 2020 Quarter are recorded within "Other income (expense)" on the Unaudited Condensed Consolidated Statements of Operations.
See Note 15 for additional information on our derivative instruments.
Other Fair Value Measurements
We believe the debt outstanding under our credit facility approximates fair value as the stated rate of interest approximates current market rates of interest for similar instruments with comparable maturities. At March 31, 2021 our senior unsecured notes had a carrying value and fair value of $2.7 billion compared to a carrying value of $2.8 billion and fair value of $2.7 billion at December 31, 2020. The fair value of the senior unsecured notes is determined based on trade information in the financial markets of our public debt and is considered a Level 2 fair value measurement.