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Derivative Financial Instruments Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair value of derivative assets and liabilities |  |  |  |
Derivative, Fair Value, Net | $ 139,400 |  | $ 91,700 |
Derivative Assets, Current | 64,266 |  | 54,521 |
Derivative Liabilities, Current | 172,582 |  | 115,464 |
Derivative Assets, Noncurrent | 40,362 |  | 67,575 |
Derivative Liabilities, Noncurrent | 71,402 |  | 98,340 |
Derivative Asset, Fair Value, Gross Asset | 104,628 |  | 122,096 |
Derivative Liability, Fair Value, Gross Liability | 243,984 |  | 213,804 |
Derivative Asset, Not Offset in the Accompanying Balance Sheets | (100,035) |  | (118,080) |
Derivative Liability, Not Offset in the Accompanying Balance Sheets | 100,035 |  | 118,080 |
Derivative Asset, Fair Value, Net Amounts | 4,593 |  | 4,016 |
Derivative Liability, Fair Value, Net Amounts | (143,949) |  | (95,724) |
Not Designated as Hedging Instrument [Member] |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |
Derivative Assets, Current | 64,266 |  | 54,521 |
Derivative Liabilities, Current | 172,582 |  | 115,464 |
Derivative Assets, Noncurrent | 40,362 |  | 67,575 |
Derivative Liabilities, Noncurrent | 71,402 |  | 98,340 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 104,628 | [1] | 122,096 | [2]
Derivative Liability, Fair Value, Gross Liability | $ 243,984 | [1] | $ 213,804 | [2]
[1] | This represents a financial asset or liability that is measured at fair value on a recurring basis.
[2] | This represents a financial asset or liability that is measured at fair value on a recurring basis.

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- Definition Fair value, after effects of master netting arrangements, deduction of assets not subject to a master netting arrangement and elected not to be offset, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, offset against an obligation to return collateral. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 + Details
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- Definition Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset, deducted from derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(1)(i) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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