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Accounting for Derivative Instruments - Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss on derivatives, net | $ (21,456) | $ (9,749)
Total current period settlements on derivatives | 7,414 | 11,272
Non-trading |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss on derivatives, net | (21,037) | (9,620)
Total current period settlements on derivatives | 7,574 | 11,277
Non-trading | Censtar and Oasis Power Holdings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss on derivatives, net | 100 | (800)
Non-trading | Provider Companies and Major Energy Companies |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss on derivatives, net | (1,300) |
Trading |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss on derivatives, net | (419) | (129)
Total current period settlements on derivatives | $ (160) | $ (5)

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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