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Accounting for Derivative Instruments - Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Current period settlements on derivatives |  |  | $ 15,120 | [1] | $ (7,252)
Cash Flow Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | $ 61 | $ (1,178) | (6,118) |  | 262
Current period settlements on derivatives | 4,163 | 3,004 | 12,887 |  | (7,252)
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | 132 | (1,163) | (5,876) |  | 5,847
Current period settlements on derivatives | 4,035 | 3,039 | 12,643 |  | (9,959)
Not Designated as Hedging Instrument | Censtar and Oasis Power Holdings |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Current period settlements on derivatives | 2,000 |  | 2,200 |  |
Not Designated as Hedging Instrument | Affiliated Entity |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | 0 | 0 |  |  |
Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | (71) | (15) | (242) |  | (5,585)
Current period settlements on derivatives | 128 | (35) | 244 |  | 2,707
Designated as Hedging Instrument | Affiliated Entity | Cash Flow Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | 0 | 0 | 0 |  | 1,792
Current period settlements on derivatives | $ 0 | $ 0 | $ 0 |  | $ 1,693
[1] | Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC on May 12, 2015 from an affiliate. See Note 2 “Basis of Presentation” and Note 3 "Acquisitions" for further discussion.

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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=56946850&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=56946850&loc=SL5624171-113959 + Details
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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