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Fair Value (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives$ 6,084$ 17,853  
Interest rate swaps 127  
Foreign currency derivatives 116  
Securities available for sale47,198   
Investments and funds held for customers104,521100,543[1]  
Funds held in trust account of Spokane Energy1,6001,600  
Total119,859128,304  
Energy commodity derivatives75,66482,468  
Foreign currency derivatives523   
Interest rate swaps14,22553  
Energy commodity derivatives90,41282,521  
Cash and cash equivalents78,10369,41356,68237,035
Money Market Funds [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds57,323[1]   
Money Market Funds [Member] | Level 1 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money market funds57,323[1]   
U.S. Government Agency [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale34,817   
U.S. Government Agency [Member] | Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale34,817   
Municipal [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale429   
Municipal [Member] | Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale429   
Corporate Fixed Income - Financial [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale7,202   
Corporate Fixed Income - Financial [Member] | Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale7,202   
Corporate Fixed Income - Industrial [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale4,750   
Corporate Fixed Income - Industrial [Member] | Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale4,750   
Fixed Income Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets2,299[2]1,854[2]  
Cash and cash equivalents1,4001,200  
Fixed Income Securities [Member] | Level 1 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets2,299[2]1,854[2]  
Equity Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets5,355[2]6,211[2]  
Equity Securities [Member] | Level 1 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets5,355[2]6,211[2]  
Level 1 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments and funds held for customers 100,543[1]  
Funds held in trust account of Spokane Energy1,6001,600  
Total66,577110,208  
Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives46,74415,124  
Interest rate swaps 127  
Foreign currency derivatives 116  
Total93,94215,367  
Energy commodity derivatives116,56493,198  
Foreign currency derivatives523   
Interest rate swaps14,22553  
Energy commodity derivatives131,31293,251  
Level 3 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives12,38819,739  
Total12,38819,739  
Energy commodity derivatives12,1486,280  
Energy commodity derivatives12,1486,280  
Counterparty Netting [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives(53,048)[3](17,010)[3]  
Total(53,048)[3](17,010)[3]  
Energy commodity derivatives(53,048)[3](17,010)[3]  
Energy commodity derivatives$ (53,048)[3]$ (17,010)[3]  
[1]Represents amounts held in money market funds.
[2]These assets are trading securities and are included in other intangibles, property and investments-net on the Condensed Consolidated Balance Sheets.
[3]The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists.