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Summary Of Significant Accounting Policies (Asset Retirement Obligations) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Regulatory Liabilities [Line Items] |  |
Non-current regulatory liabilities | $ 775,436 | $ 780,701
Removal Costs [Member] |  |
Regulatory Liabilities [Line Items] |  |
Non-current regulatory liabilities | $ 312,403 | $ 297,379

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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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