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Fair-Value Measurements
12 Months Ended
Dec. 31, 2020
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 December 31, 2020 and 2019.
 
 December 31, 2020December 31, 2019
Recurring Fair Value MeasuresLevel 1Level 2Level 3Level 1Level 2Level 3
Commodity derivatives:
Assets$1,754 $616 $— $211 $1,382 $— 
Liabilities$(5,459)$— $— $(2,129)$— $— 
Preferred Distribution Rate Reset Election$— $— $(52,372)$— $— $(51,515)

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:
Balance as of December 31, 2018$(40,840)
Net loss for the period including earnings(9,026)
Allocation of Distribution Paid-in-kind(1,649)
Balance as of December 31, 2019(51,515)
Net loss for the period included in earnings(857)
Balance as of December 31, 2020$(52,372)
    
    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 December 31, 2020.
    The fair value of embedded derivative feature is based on a valuation model that estimates the fair value of the convertible preferred units with and without a Rate Reset Election. This model contains inputs, including our common unit price, a ten year history of the dividend yield, default probabilities and timing estimates which involve management judgment. 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. We report unrealized gains and losses associated with this embedded derivative in our Consolidated Statements of Operations as Other income (expense).
    See Note 18 for additional information on our derivative instruments.
Nonfinancial Assets and Liabilities
    We utilize fair value on a non-recurring basis to perform impairment tests as required on our property, plant and equipment, goodwill and intangible assets. Assets and liabilities acquired in business combinations are recorded at their fair value as of the date of acquisition. The inputs used to determine such fair value are primarily based upon internally developed cash flow models and would generally be classified in Level 3, in the event that we were required to measure and record such assets within our Consolidated Financial Statements. Additionally, we use fair value to determine the inception value of our asset retirement obligations. The inputs used to determine such fair value are primarily based upon costs incurred historically for similar work, as well as estimates from independent third parties for costs that would be incurred to restore leased property to the contractually stipulated condition, and would generally be classified in Level 3.
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 December 31, 2020 our senior unsecured notes had a carrying value of $2.8 billion and fair value of $2.7 billion, compared to a carrying value and fair value of $2.5 billion at December 31, 2019. 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.