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Fair Value Measurements
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements
(12) Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis are summarized below (in millions):
Level 2
September 30, 2021December 31, 2020
Interest rate swaps (1)$(0.7)$(7.6)
Commodity swaps (2) $(35.0)$(2.1)
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(1)The fair values of the interest rate swaps are estimated based on the difference between expected cash flows calculated at the contracted interest rates and the expected cash flows using observable benchmarks for the variable interest rates.
(2)The fair values of commodity swaps represent the amount at which the instruments could be exchanged in a current arms-length transaction adjusted for our credit risk and/or the counterparty credit risk as required under ASC 820, Fair Value Measurement.

Fair Value of Financial Instruments

The estimated fair value of our financial instruments has been determined using available market information and valuation methodologies. Considerable judgment is required to develop the estimates of fair value; thus, the estimates provided below are not necessarily indicative of the amount we could realize upon the sale or refinancing of such financial instruments (in millions):
September 30, 2021December 31, 2020
Carrying ValueFair
Value
Carrying ValueFair
Value
Long-term debt (1)$4,392.6 $4,466.7 $4,593.8 $4,318.2 
Installment payable (2)$10.0 $10.0 $— $— 
Contingent consideration (2)$6.9 $6.9 $— $— 
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(1)The carrying value of long-term debt includes current maturities and is reduced by debt issuance costs of $28.9 million and $32.6 million as of September 30, 2021 and December 31, 2020, respectively. The respective fair values do not factor in debt issuance costs.
(2)Consideration paid for the acquisition of Amarillo Rattler, LLC included $10 million to be paid on April 30, 2022 and a contingent consideration capped at $15 million and payable between 2024 and 2026 based on Diamondback Energy’s drilling activity above historical levels. Estimated fair values were calculated using a discounted cash flow analysis that utilized Level 3 inputs. For additional information regarding this transaction, refer to “Note 2—Significant Accounting Policies.”

The carrying amounts of our cash and cash equivalents, accounts receivable, and accounts payable approximate fair value due to the short-term maturities of these assets and liabilities.
The fair values of all senior unsecured notes as of September 30, 2021 and December 31, 2020 were based on Level 2 inputs from third-party market quotations.