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Fair-Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Placement Of Assets And Liabilities Within The Fair Value Hierarchy Levels
 
December 31, 2014
 
December 31, 2013
Recurring Fair Value Measures
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Commodity derivatives:
 
 
 
 
 
 
 
 
 
 
 
Assets
$
16,383

 
$
—

 
$
—

 
$
615

 
$
—

 
$
—

Liabilities
$
(2,310
)
 
$
—

 
$
—

 
$
(4,527
)
 
$
—

 
$
—