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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Available-for-sale Securities
The following is a summary of available-for-sale securities:

 
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
(In thousands)
Equity Securities:
 
 
September 30, 2017
 
$
830

 
$
85

 
$
—

 
$
915

December 31, 2016
 
$
—

 
$
—

 
$
—

 
$
—
Recurring Fair Value Measurements
The following tables set forth our recurring fair value measurements:
 
 
September 30, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
Effect
of Netting
 
Net Amounts Presented
 
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
 
 
 
Assets
 
$
—

 
$
662

 
$
1,964

 
$
(1,562
)
 
$
1,064

Liabilities
 
—

 
(2,002
)
 
(478
)
 
1,562

 
(918
)
Total commodity derivatives
 
—

 
(1,340
)
 
1,486

 
—

 
146

Equity securities
 
915

 
—

 
—

 
—

 
915

 
 
$
915

 
$
(1,340
)
 
$
1,486

 
$
—

 
$
1,061

 
 
December 31, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Effect
of Netting
 
Net Amounts Presented
 
 
(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
The following table is a reconciliation of our level 3 fair value measurements: 
 
 
Net Derivatives
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(In thousands)
Beginning of period
 
$
4,093

 
$
(4,761
)
 
$
(7,122
)
 
$
9,094

Total gains or losses (realized and unrealized):
 
 
 
 
 
 
 
 
Included in earnings (1)
 
(2,015
)
 
3,077

 
9,102

 
(3,257
)
Settlements
 
(592
)
 
(443
)
 
(494
)
 
(7,964
)
End of period
 
$
1,486

 
$
(2,127
)
 
$
1,486

 
$
(2,127
)
Total gains (losses) for the period included in earnings attributable to the change in unrealized gain relating to assets still held at end of period
 
$
(2,607
)
 
$
2,634

 
$
8,608

 
$
(11,221
)
_______________________
(1)
Commodity derivatives are reported in the Unaudited Condensed Consolidated Statements of Operations in gain (loss) on derivatives.
Schedule Of Quantitative Information About Unobservable Inputs
The following table provides quantitative information about our Level 3 unobservable inputs at September 30, 2017:
Commodity (1)
 
Fair Value
 
Valuation Technique
 
Unobservable Input
 
Range
 
 
(In thousands)
 
 
 
 
 
 
Oil three-way collars
 
$
(9
)
 
Discounted cash flow
 
Forward commodity price curve
 
($3.65) - $5.02
Natural gas collar
 
$
25

 
Discounted cash flow
 
Forward commodity price curve
 
($0.11) - $0.06
Natural gas three-way collars
 
$
1,470

 
Discounted cash flow
 
Forward commodity price curve
 
($0.34) - $0.54
 _______________________
(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 paid or received within the settlement period.