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Fair-Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
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, 2018 and December 31, 2017. 
 
 
Fair Value at
 
Fair Value at
 
 
June 30, 2018
 
December 31, 2017
Recurring Fair Value Measures
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Commodity derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
Assets
 
$
1,252

 
$
43

 
$
—

 
$
559

 
$
—

 
$
—

Liabilities
 
$
(4,463
)
 
$
(74
)
 
$
—

 
$
(2,066
)
 
$
—

 
$
—

Preferred Distribution Rate Reset Election
 
$
—

 
$
—

 
$
(49,409
)
 
$
—

 
$
—

 
$
(45,209
)
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,
 
2018
Balance as of December 31, 2017
$
(45,209
)
Change in fair value included in earnings
(2,094
)
Allocation of Distribution Paid-in-kind
(2,106
)
Balance as of June 30, 2018
$
(49,409
)