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Contingencies (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 claims | Sep. 30, 2013 claims | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 1997 | Sep. 30, 2008 | Sep. 30, 2000 | Dec. 31, 1993
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
investment in Trojan |  |  |  |  |  |  |  | 87.00%
Regulatory asset related to Trojan |  |  |  |  |  |  | $ 5,000,000 |
Refund to customers for Trojan Investment including interest |  |  |  |  |  | 33,100,000 |  |
Class action damages sought | 260,000,000 | 260,000,000 |  |  |  |  |  |
Site Contingency, Names of Other Potentially Responsible Parties |  | 100 |  |  | 69 |  |  |
Civil Penalty Claim - Per day per violation through January 12, 2009 |  | 32,500 |  |  |  |  |  |
Civil Penalty Claim - Per day per violation after January 12, 2009 |  | 37,500 |  |  |  |  |  |
Claims moved to dismiss | 36 | 36 |  |  |  |  |  |
Loss Contingency, Pending Claims, Number | 39 | 39 |  |  |  |  |  |
Low estimate of range of cost of Portland Harbor cleanup in total | 169,000,000 | 169,000,000 |  |  |  |  |  |
Upper estimated range of total cost of Portland harbor cleanup | 1,800,000,000 | 1,800,000,000 |  |  |  |  |  |
Potential Income Tax Liability related to State Tax Court Ruling | 7,000,000 | 7,000,000 |  |  |  |  |  |
Damages sought in USDOE claim |  |  |  | 112,000,000 |  |  |  |
Loss Contingency, Damages Awarded, Value | 70,000,000 |  |  |  |  |  |  |
Proceeds received from Trojan spent fuel legal settlement |  | $ 44,000,000 | $ 0 |  |  |  |  |

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- Definition The portion of the Company's remaining investment in its Trojan plant that the OPUC allowed the Company to recover. + References No definition available. + Details
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