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Contingencies (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
claims
Sep. 30, 2014
claims
Dec. 31, 1997
Dec. 31, 2013
claims
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          
Loss Contingency, Claims Settled, Number   2          
Contracts   119          
Site Contingency, Names of Other Potentially Responsible Parties   100 69        
Lower 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          
Loss Contingency, Actions Taken by Defendant   36          
projects added to plaintiff's suit 2            
Loss Contingency, Pending Claims, Number   39   40      
Potential Income Tax Liability related to State Tax Court Ruling   $ 7,000,000