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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Recurring Fair Value Measurements
The following tables set forth our recurring fair value measurements:
 
March 31, 2013
 
Level 2
 
Level 3
 
Gross Amounts
 
Effect of Netting
 
Net Amounts Presented
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
 
 
Assets
$
6,727

 
$
36

 
$
6,763

 
(3,546
)
 
$
3,217

Liabilities
(15,883
)
 
(2,572
)
 
(18,455
)
 
3,546

 
(14,909
)
 
$
(9,156
)
 
$
(2,536
)
 
$
(11,692
)
 
—

 
$
(11,692
)
 
 
December 31, 2012
 
Level 2
 
Level 3
 
Gross Amounts
 
Effect of Netting
 
Net Amounts Presented
 
(In thousands)
Financial assets (liabilities):
 
 
 
 
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
 
 
 
 
Assets
$
18,555

 
$
—

 
$
18,555

 
(2,003
)
 
$
16,552

Liabilities
(3,918
)
 
(595
)
 
(4,513
)
 
2,003

 
(2,510
)
 
$
14,637

 
$
(595
)
 
$
14,042

 
—

 
$
14,042
Reconciliations Of Level 3 Fair Value Measurements
The following table is a reconciliation of our level 3 fair value measurements: 
 
 
 
Commodity Collars
 
For the three months ended March 31, 2013
 
For the three months ended March 31, 2012
 
(In thousands)
Beginning of period
$
(595
)
 
$
33,615

Total gains or losses (realized and unrealized):
 
 
 
Included in earnings (1)
(1,941
)
 
11,417

Included in other comprehensive income (loss)
—

 
2,111

Settlements
—

 
(11,307
)
Transfers out of Level 3 into Level 2
—

 
(21,924
)
End of period
$
(2,536
)
 
$
13,912

Total gains for the period included in earnings attributable to the change in unrealized gain relating to assets still held at end of period
$
(1,941
)
 
$
110

 
(1)
Commodity collars are reported in the Unaudited Condensed Consolidated Statements of Income in oil and natural gas revenues (for cash flow hedges) and loss on derivatives not designated as hedges and hedge ineffectiveness, net, respectively.
Schedule Of Quantitative Information About Unobservable Inputs
The following table provides quantitative information about our Level 3 unobservable inputs at March 31, 2013:
 
Fair Value
Valuation Technique
Unobservable Input
Range
 
(In thousands)
 
 
 
Commodity collars (1)
$
(2,536
)
Discounted cash flow
Forward commodity price curve
$0.00-$8.52
 
(1)
The commodity contracts detailed in this category include non-exchange-traded natural gas and crude oil 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.