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Regulatory Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | $ 113,543 | $ 229,180 |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 33,330 | 24,538 |
Debt make-whole premium | 6,757 | 0 | 0
Conservation Costs Regulatory Liability [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 455 | 455 |
Deferred Fuel Savings [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 13,386 | 6,163 |
Elm Road Regulatory Liability [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 607 | 0 |
Income Taxes [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 2,082 | 2,346 |
Non-ARO Removal Cost [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 15,182 | 13,957 |
Renewable Energy Credits [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 574 | 480 |
Other Regulatory Liability [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | 1,044 | 1,137 |
Asset Retirement Obligation [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 4,863 | 4,608 |
Debt Related Costs [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 11,786 | 5,468 |
Derivatives [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 63,893 | 72,328 |
Elm Road Regulatory Asset [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 0 | 2,614 |
Environmental Costs [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 920 | 1,154 |
Pension and OPRB Costs [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 0 | 1,234 |
Tax Recovery AFUDC Equity [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 6,956 | 5,241 |
Unfunded Pension and Other Postretirement Plans Costs [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | 24,591 | 134,839 |
Other Regulatory Asset [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Assets | $ 534 | $ 1,694 |

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- Definition The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal. + References No definition available. + Details
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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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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities 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 11 -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. + Details
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