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Summary Of Significant Accounting Policies (Materials And Supplies Fuel Stock And Natural Gas Stored) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Accounting Policies [Abstract] |  |
Materials and supplies | $ 41,492 | $ 40,700
Fuel stock | 5,921 | 4,585
Natural gas stored | 13,774 | 8,029
Total | $ 61,187 | $ 53,314

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- Definition Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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