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Other Financial Information (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Apr. 30, 2016
Other Financial Information [Line Items] |  |  |
Gain on sale of assets | $ 131,982 | $ 22 |
Montney Natural Gas Fields [Member] |  |  |
Other Financial Information [Line Items] |  |  |
Deferred gain on sale of property | $ 176,700 |  | $ 187,000
Deferred gain, period of recognition | 20 years |  |
Gain on sale of assets | $ 1,700 |  |

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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228 + Details
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- Details
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