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Fair-Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
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 December 31, 2017 and 2016.
 

 
December 31, 2017
 
December 31, 2016
Recurring Fair Value Measures
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Commodity derivatives:
 
 
 
 
 
 
 
 
 
 
 
Assets
$
559

 
$
—

 
$
—

 
$
3,764

 
$
—

 
$
—

Liabilities
$
(2,066
)
 
$
—

 
$
—

 
$
(11,278
)
 
$
—

 
$
—

Preferred Distribution Rate Reset Election
$
—

 
$
—

 
$
(45,209
)
 
$
—

 
$
—

 
$
—
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table provides a reconciliation of changes in fair value at the beginning and ending balances for our derivatives classified as level 3:

 
 
Year Ended December 31,
 
 
2017
Beginning Balance
 
—
Initial valuation of Preferred Distribution Rate Reset Election
 
$
(34,450
)
Net Loss for the period included in earnings
 
(10,472
)
Allocation of Distribution Paid-in-kind
 
(287
)
Ending Balance
 
$
(45,209
)