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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Recurring Fair Value Measurements [Table Text Block]
The following tables set forth our recurring fair value measurements:

 
December 31, 2015
 
Level 2
 
Level 3
 
Effect of Netting
 
Total
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
Assets
$
2,794

 
$
10,145

 
$
(1,785
)
 
$
11,154

Liabilities
(1,019
)
 
(1,051
)
 
1,785

 
(285
)
 
$
1,775

 
$
9,094

 
$
—

 
$
10,869


 
December 31, 2014
 
Level 2
 
Level 3
 
Effect of Netting
 
Total
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
Assets
$
27,784

 
$
3,355

 
$
—

 
$
31,139

Liabilities
—

 
—

 
—

 
—

 
$
27,784

 
$
3,355

 
$
—

 
$
31,139
Reconciliations Of Level 3 Fair Value Measurements [Table Text Block]
The following tables are reconciliations of our level 3 fair value measurements: 
 
Net Derivatives
 
For the Year Ended,
 
December 31, 2015
 
December 31, 2014
 
(In thousands)
Beginning of period
$
3,355

 
$
(2,595
)
Total gains or losses:
 
 
 
Included in earnings (1)
15,260

 
6,108

Settlements
(9,521
)
 
(158
)
End of period
$
9,094

 
$
3,355

Total gains for the period included in earnings attributable to the change in unrealized loss relating to assets still held at end of period
$
5,739

 
$
5,950

_________________________
(1)
Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net.
Schedule Of Quantitative Information About Unobservable Inputs [Table Text Block]
The following table provides quantitative information about our Level 3 unobservable inputs at December 31, 2015:
Commodity (1)
Fair Value
Valuation Technique
Unobservable Input
Range
 
(In thousands)
 
 
 
Oil collars
$
3,893

Discounted cash flow
Forward commodity price curve
$0.40 - $55.05
Oil three-way collar
3,470

Discounted cash flow
Forward commodity price curve
$0.40 - $71.66
Natural gas collar
1,000

Discounted cash flow
Forward commodity price curve
$0.40 - $1.26
Natural gas three-way collar
731

Discounted cash flow
Forward commodity price curve
$0.40 - $1.93
 _________________________
(1)
The commodity contracts detailed in this category include non-exchange-traded crude oil and natural gas collars and three-way collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be received within the settlement period.