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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Recurring Fair Value Measurements [Table Text Block]
The following tables set forth our recurring fair value measurements:
 
 
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


 
December 31, 2013
 
Level 2
 
Level 3
 
Effect of Netting
 
Total
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
Assets
$
1,978

 
$
20

 
$
(1,483
)
 
$
515

Liabilities
(4,429
)
 
(2,615
)
 
1,483

 
(5,561
)
 
$
(2,451
)
 
$
(2,595
)
 
$

 
$
(5,046
)
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, 2014
 
December 31, 2013
 
(In thousands)
Beginning of period
$
(2,595
)
 
$
(595
)
Total gains or losses:
 
 
 
Included in earnings (1)
6,108

 
(2,637
)
Included in other comprehensive income (loss)

 

Settlements
(158
)
 
637

End of period
$
3,355

 
$
(2,595
)
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
$
5,950

 
$
(2,000
)
_________________________
(1)
Commodity sales collars are reported in the consolidated statements of income in oil and gas revenues (for cash flow hedges), and gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net, respectively.
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, 2014:
Commodity (1)
Fair Value
Valuation Technique
Unobservable Input
Range
 
(In thousands)
 
 
 
Natural gas collar
$
3,355

Discounted cash flow
Forward commodity price curve
$0.00 - $1.32
 _________________________
(1)
The commodity contracts detailed in this category include non-exchange-traded natural gas 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.