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Derivative Instruments - Designated and Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivatives not designated as hedging instruments
Amount of gain recognized in operating revenues	$ 140,742	$ 108,995
Not designated as hedging instrument
Derivatives not designated as hedging instruments
Amount of gain recognized in operating revenues	140,742	108,995
Cash flow hedging | Designated as hedging instrument | Commodity derivatives
Commodity/Interest rate derivatives designated as cash flow hedges
Amount of gain (loss) reclassified from accumulated OCI, net of tax (effective portion)	888	12,424
Cash flow hedging | Designated as hedging instrument | Interest rate derivatives
Commodity/Interest rate derivatives designated as cash flow hedges
Amount of gain (loss) reclassified from accumulated OCI, net of tax (effective portion)	$ (36)	$ (36)

X

- 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=64837297&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=64837297&loc=SL5624177-113959

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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=64837297&loc=SL5624171-113959

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