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Fair-Value Measurements (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2017 and December 31, 2016. 
 
 
Fair Value at
 
Fair Value at
 
 
June 30, 2017
 
December 31, 2016
Recurring Fair Value Measures
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Commodity derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
Assets
 
$
1,908

 
$
—

 
$
—

 
$
3,764

 
$
—

 
$
—

Liabilities
 
$
(2,198
)
 
$
—

 
$
—

 
$
(11,278
)
 
$
—

 
$
—