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Fair-Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of 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 June 30, 2020 and December 31, 2019. 
 Fair Value atFair Value at
June 30, 2020December 31, 2019
Recurring Fair Value MeasuresLevel 1Level 2Level 3Level 1Level 2Level 3
Commodity derivatives:
Assets$1,204  $937  $—  $211  $1,382  $—  
Liabilities$(6,437) $(67) $—  $(2,129) $—  $—  
Preferred Distribution Rate Reset Election$—  $—  $(40,809) $—  $—  $(51,515) 
Schedule of Reconciliation of Changes in Fair Value of Derivatives Classified as Level 3 The following table provides a reconciliation of changes in fair value at the beginning and ending balances for our derivatives classified as level 3:
 Six Months Ended
June 30,
2020
Balance as of December 31, 2019$(51,515) 
Unrealized gain for the period included in earnings10,706  
Balance as of June 30, 2020$(40,809)