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Derivative Instruments (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 BillionsCubicFeet | Jun. 30, 2010 | Jun. 30, 2011 segments BillionsCubicFeet | Jun. 30, 2010 | Dec. 31, 2010 BillionsCubicFeet
Derivatives designated as cash flow hedges |  |  |  |  |
Amount of (loss) gain recognized in other comprehensive income (OCI) (effective portion), net of tax | $ 33,253,000 | $ (16,293,000) | $ 37,452,000 | $ 61,226,000 |
Amount of gain reclassified from accumulated OCI into income (effective portion), net of tax | 9,918,000 | 14,111,000 | 26,823,000 | 28,218,000 |
Amount of (loss) gain recognized in income (ineffective portion) | 364,000 | (2,414,000) | (261,000) | (613,000) |
Derivatives designated as fair value hedges |  |  |  |  |
Amount of gain (loss) recognized in income for fair value commodity contracts | 1,363,000 |  | (533,000) |  |
Fair value gain (loss) recognized in income for inventory designated as hedged item | 60,000 |  | 1,693,000 |  |
Derivatives not designated as hedging instruments: |  |  |  |  |
Amount of gain (loss) recognized in income | 856,000 | 212,000 | (823,000) | 89,000 |
Unrealized hedge gains reclassified into earnings |  | 0 |  | 2,600,000 |
Amount of gain recognized in income due to exclusion of the spot/forward differential from the assessment of effectiveness | 2,100,000 |  | 1,500,000 |  |
Amount of loss recognized in income due to changes in basis | 700,000 |  | 300,000 |  |
Asset derivatives |  |  |  |  |
Derivatives designated as hedging instruments | 138,004,000 |  | 138,004,000 |  | 141,834,000
Derivatives not designated as hedging instruments | 73,982,000 |  | 73,982,000 |  | 83,505,000
Total asset derivatives | 211,986,000 |  | 211,986,000 |  | 225,339,000
Liability derivatives |  |  |  |  |
Derivatives designated as hedging instruments | 3,104,000 |  | 3,104,000 |  | 12,097,000
Derivatives not designated as hedging instruments | 94,427,000 |  | 94,427,000 |  | 94,624,000
Total liability derivatives | 97,531,000 |  | 97,531,000 |  | 106,721,000
Absolute quantities of derivative commodity instruments that have been designated and qualify as cash flow hedges (in Bcf) | 240 |  | 240 |  | 181
Absolute quantities of the derivative commodity instruments that have been designated and qualify as fair value hedges (in Bcf) | 6 |  | 6 |  |
Deferred net gains in accumulated other comprehensive income (loss), net of tax | 75,900,000 |  | 75,900,000 |  | 65,200,000
Net unrealized gains on derivative commodity instruments | 34,800,000 |  | 34,800,000 |  |
Margin deposits with brokers | 1,600,000 |  | 1,600,000 |  |
Margin deposits remitted by brokers with company |  |  |  |  | 500,000
Additional collateral limit for below investment grade derivative instruments, as a percentage of the derivative liability (as a percent) |  |  | 100.00% |  |
Aggregate fair value of derivative instruments with credit-risk related contingencies | 4,600,000 |  | 4,600,000 |  |
Additional collateral for downgrade below investment grade | $ 4,600,000 |  | $ 4,600,000 |  |

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualified as the effective portion of cash flow hedges, excluding certain interest rate swap transactions. + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain or loss on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44D -Subparagraph b + Details
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