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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Recurring Fair Value Measurements [Table Text Block]
The following tables set forth our recurring fair value measurements:
 
December 31, 2016
 
Level 2
 
Level 3
 
Effect of Netting
 
Total
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
Assets
$
878

 
$
43

 
$
(544
)
 
$
377

Liabilities
(15,358
)
 
(7,165
)
 
544

 
(21,979
)
 
$
(14,480
)
 
$
(7,122
)
 
$
—

 
$
(21,602
)

 
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
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, 2016
 
December 31, 2015
 
(In thousands)
Beginning of period
$
9,094

 
$
3,355

Total gains or losses:
 
 
 
Included in earnings (1)
(9,042
)
 
15,260

Settlements
(7,174
)
 
(9,521
)
End of period
$
(7,122
)
 
$
9,094

Total gains (losses) for the period included in earnings attributable to the change in unrealized loss relating to assets still held at end of period
$
(16,216
)
 
$
5,739

_________________________
(1)
Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives.
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, 2016:
Commodity (1)
Fair Value
Valuation Technique
Unobservable Input
Range
 
(In thousands)
 
 
 
Oil three-way collar
(1,167
)
Discounted cash flow
Forward commodity price curve
$0.00 - $4.29
Natural gas collar
(3,332
)
Discounted cash flow
Forward commodity price curve
$0.00 - $0.79
Natural gas three-way collar
(2,623
)
Discounted cash flow
Forward commodity price curve
$0.00 - $0.71
 _________________________
(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.