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Derivatives - Effect on Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Gain (loss) on derivative |  |  |  |
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges |  | $ 0 | $ 0 |
Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Net (losses) gains related to the ineffectiveness between the entity's derivative hedging instruments and hedged items |  | (100) |  |
Cost of revenue. |  |  |  |
Gain (loss) on derivative |  |  |  |
Net (losses) gains related to the ineffectiveness between the entity's derivative hedging instruments and hedged items |  | (2,900) |  |
Commodity contracts |  |  |  |
Derivative, credit-risk related contingent features |  |  |  |
Net liability position |  | 50,000 |  | $ 63,200
Collateral posted |  | (11,300) |  | (28,100)
Contingent additional collateral |  | 38,700 |  | 35,000
Cash flow hedges. |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Loss Recognized in Accumulated Other Comprehensive Income (Effective Portion) | [1] | (2,200) |  |
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) | [1] | 500 |  |
Amount of Gain Recognized in Income (Ineffective Portion) | [1] | 2,800 |  |
Cash flow hedges. | Commodity contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Loss Recognized in Accumulated Other Comprehensive Income (Effective Portion) | [1] | (46,500) |  |
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) | [1] | (53,800) |  |
Amount of Loss Recognized in Income (Ineffective Portion) | [1] | (100) |  |
Cash flow hedges. | Commodity contracts | Cost of revenue. |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Gain Recognized in Accumulated Other Comprehensive Income (Effective Portion) | [1] | 44,200 |  |
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) | [1] | 54,300 |  |
Amount of Gain Recognized in Income (Ineffective Portion) | [1] | 2,900 |  |
Derivatives designated as hedging instruments | Fair value hedges |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Hedge | [1] | 6,100 | 4,000 |
Realized and Unrealized Gain (Loss) on Hedged Item | [1] | (3,200) | (500) |
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Hedge | [1] | 88,000 |  |
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Cost of revenue. |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Hedge | [1] | (81,900) |  | 4,000
Realized and Unrealized Gain (Loss) on Hedged Item | [1] | (3,200) |  | $ (500)
Derivatives not designated as hedging instruments |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) | [1] | (11,900) | 22,000 |
Derivatives not designated as hedging instruments | Commodity contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) | [1] | 38,900 | 20,600 |
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue. |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) | [1] | (47,500) | (11,700) |
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) | [1] | 1,900 | 3,900 |
Derivatives not designated as hedging instruments | Foreign currency contracts | Other income (expense), net |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) | [1] | $ (5,200) | $ 9,200 |
[1] | Amounts may not add due to rounding

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + 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=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 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=56946850&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=56946850&loc=SL5624177-113959 + Details
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- Definition The portion of gains on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + 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) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + Details
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- Definition Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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