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Contingencies (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) claims | Jun. 30, 2013 claims | Dec. 31, 1997 | Dec. 31, 2015 USD ($) | 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 |  |  |
Remediation cost estimate lower range | $ 800,000,000 |  |  |  |  |
Remediation cost estimate upper range | 2,400,000,000 |  |  | $ 1,500,000,000 |  |
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 | 40 | 39 |  |  |  |

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- Definition Class action lawsuit damages sought by plaintiffs against the Company. + References No definition available. + Details
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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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