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Derivative Instruments - Designated and Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Derivatives not designated as hedging instruments |  |  |  |  |
Amount of gain (loss) recognized in gain (loss) on derivatives not designated as hedges |  |  |  | $ 47,851 | $ (17,879)
Not Designated as Hedging Instrument |  |  |  |  |
Derivatives not designated as hedging instruments |  |  |  |  |
Amount of gain (loss) recognized in gain (loss) on derivatives not designated as hedges |  | $ 4,259 | $ (8,525) | 47,851 | (17,879)
Cash Flow Hedging | Commodity Derivatives |  |  |  |  |
Commodity derivatives designated as cash flow hedges |  |  |  |  |
Amount of loss recognized in OCI (effective portion), net of tax |  | 0 | (13,455) | 0 | (52,649)
Amount of gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets due to forecasted transactions probable to not occur |  | 0 | 16,735 | 0 | 16,735
Amount of gain (loss) reclassified from accumulated OCI, net of tax, into operating revenues (effective portion) |  | 42,581 | (10,883) | 83,332 | (28,146)
Amount of gain (loss) recognized in operating revenues (ineffective portion) | [1] | 0 | 987 | 0 | (21,273)
Interest rate derivatives designated as cash flow hedges |  |  |  |  |
Amount of loss reclassified from accumulated OCI, net of tax, into interest expense (effective portion) |  | 42,581 | (10,883) | 83,332 | (28,146)
Cash Flow Hedging | Interest Rate Contract |  |  |  |  |
Commodity derivatives designated as cash flow hedges |  |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI, net of tax, into operating revenues (effective portion) |  | (36) | (36) | (72) | (72)
Interest rate derivatives designated as cash flow hedges |  |  |  |  |
Amount of loss reclassified from accumulated OCI, net of tax, into interest expense (effective portion) |  | $ (36) | $ (36) | $ (72) | $ (72)
[1] | No amounts were excluded from effectiveness testing of cash flow hedges.

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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of price risk derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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