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Contingencies (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 claims | Sep. 30, 2013 claims | Dec. 31, 1997 | Dec. 31, 2013 | 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 |  |  |  |  |  |
contracts | 119 |  |  |  |  |  |
Site Contingency, Names of Other Potentially Responsible Parties | 100 |  | 69 |  |  |  |
Low estimate of range of cost of Portland Harbor cleanup in total | 169,000,000 |  |  |  |  |  |
Upper estimated range of total cost of Portland harbor cleanup | 1,800,000,000 |  |  |  |  |  |
Remediation cost estimate lower range | 3,000,000 |  |  | 3,000,000 |  |  |
Remediation cost estimate upper range |  |  |  | 8,000,000 |  |  |
Loss Contingency, Estimate of Possible Loss | 3,000,000 |  |  |  |  |  |
regulatory asset for recovery of loss contingencies | 3,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Loss Contingency, Pending Claims, Number | 39 |  |  |  |  |  |
projects added to plaintiff's suit | 12 | 2 |  |  |  |  |
projects encompassed by suit | 40 |  |  |  |  |  |
Potential Income Tax Liability related to State Tax Court Ruling | $ 7,000,000 |  |  |  |  |  |

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