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Rate and Regulatory Matters (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Regulatory Assets | $ 72,831 | $ 67,302
Postretirement Benefits |  |
Regulatory Assets | 53,142 | 49,735
Remaining recovery period | Various |
Income Taxes |  |
Regulatory Assets | 17,866 | 17,151
Remaining recovery period | Various |
Rate Cases, Storm Costs, Tank Painting, and Other |  |
Regulatory Assets | $ 1,823 | $ 416
Remaining recovery period | 2-9 years |

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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