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Contingencies (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 claims | Sep. 30, 2015 USD ($) claims | Dec. 31, 1997 | Dec. 31, 2014 USD ($) | Sep. 30, 2008 USD ($) | Dec. 31, 1993
Loss Contingencies [Line Items] |  |  |  |  |  |
Investment in Trojan |  |  |  |  |  | 87.00%
Refund to customers for Trojan Investment including interest |  |  |  |  | $ 33,000,000 |
Class action damages sought |  | $ 260,000,000 |  |  |  |
Site Contingency, Names of Other Potentially Responsible Parties |  | 100 | 69 |  |  |
Lower estimate of range of cost of Portland Harbor cleanup in total |  | $ 800,000,000 |  |  |  |
Upper estimated range of total cost of Portland Harbor cleanup |  | 2,400,000,000 |  |  |  |
Remediation cost estimate lower range |  | 3,000,000 |  |  |  |
Remediation cost estimate upper range |  | 8,000,000 |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 3,000,000 |  | $ 3,000,000 |  |
Regulatory asset for recovery of loss contingencies |  | 2,000,000 |  | $ 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 |  |  |  |
Loss Contingency, Actions Taken by Defendant | 36 |  |  |  |  |
projects added to plaintiff's suit | claims |  | 2 |  |  |  |
Loss Contingency, Pending Claims, Number | claims | 39 | 40 |  |  |  |

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