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Accounting for Derivative Instruments - Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	$ 22,407	$ (18,497)	$ (14,535)
Current period settlements on derivatives	(2,146)	20,547	(3,479)
Non-trading
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	22,254	(18,423)	(8,713)
Current period settlements on derivatives	(2,284)	20,279	(6,289)
Non-trading | Censtar and Oasis
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	1,000	3,400
Non-trading | Provider Companies and Major Energy Companies
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	25,600
Trading | Affiliated Entity
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	0	203	1,509
Current period settlements on derivatives	0	315	(1,780)
Cash flow hedges | Non-trading | Affiliated Entity
Derivative Instruments, Gain (Loss) [Line Items]
Ineffectiveness gain (loss)			(288)
Non-cash Flow hedges | Non-trading
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	22,254	(18,423)	(8,713)
Current period settlements on derivatives	(2,284)	20,279	(6,289)
Non-cash Flow hedges | Trading
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	153	(74)	(5,822)
Current period settlements on derivatives	$ 138	$ 268	$ 2,810

X

- Definition

Gain (Loss) on Sale of Derivatives, Settlements, Not Designated

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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