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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Available-for-sale Securities [Table Text Block]
The following is a summary of available-for-sale securities:

 
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
(In thousands)
Equity Securities:
 
 
December 31, 2017
 
$
830

 
$
102

 
$
—

 
$
932

December 31, 2016
 
$
—

 
$
—

 
$
—

 
$
—
Recurring Fair Value Measurements [Table Text Block]
The following tables set forth our recurring fair value measurements:
 
December 31, 2017
 
Level 2
 
Level 3
 
Effect of Netting
 
Total
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
Assets
$
2,137

 
$
3,344

 
$
(4,760
)
 
$
721

Liabilities
(8,973
)
 
(3,550
)
 
4,760

 
(7,763
)
 
$
(6,836
)
 
$
(206
)
 
$
—

 
$
(7,042
)

 
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
)
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, 2017
 
December 31, 2016
 
(In thousands)
Beginning of period
$
(7,122
)
 
$
9,094

Total gains or losses:
 
 
 
Included in earnings (1)
7,791

 
(9,042
)
Settlements
(875
)
 
(7,174
)
End of period
$
(206
)
 
$
(7,122
)
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
$
6,916

 
$
(16,216
)
_________________________
(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, 2017:
Commodity (1)
Fair Value
Valuation Technique
Unobservable Input
Range
 
(In thousands)
 
 
 
Oil collars
$
(77
)
Discounted cash flow
Forward commodity price curve
$0.00 - $2.48
Oil three-way collar
(3,473
)
Discounted cash flow
Forward commodity price curve
$0.00 - $5.96
Natural gas three-way collar
3,344

Discounted cash flow
Forward commodity price curve
$0.00 - $0.68
 _________________________
(1)
The commodity contracts detailed in this category include non-exchange-traded crude oil collars and crude and natural gas 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.