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Derivatives (Effects on Consolidated Statements of Operations and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives, amount of gain (loss) recognized in income |  | $ 3,802 | $ (19,042) | $ 14,925
Embedded Derivative Financial Instruments [Member] | Other Expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives, amount of gain (loss) recognized in income | $ (10,472) |  | 0 | 0
Designated as Hedging Instrument [Member] | Commodity Derivatives [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives, amount of gain (loss) recognized in income |  |  |  | (1,101)
Designated as Hedging Instrument [Member] | Commodity Derivatives [Member] | Onshore facilities and transportation product costs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives, amount of gain (loss) recognized in income |  | 5,116 | (13,195) |
Not Designated As Hedging Instrument [Member] | Commodity Derivatives [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives, amount of gain (loss) recognized in income |  |  |  | $ 16,026
Not Designated As Hedging Instrument [Member] | Commodity Derivatives [Member] | Onshore facilities and transportation product costs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives, amount of gain (loss) recognized in income |  | $ (1,314) | $ (5,847) |

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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=84234895&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=84234895&loc=SL5624171-113959 + Details
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