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Accounting for Derivative Instruments - Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Gain (Loss) on Sale of Derivatives, Settlements, Not Designated + References No definition available. + Details
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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 + Details
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- Definition 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 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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