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Fair Value (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset $ 89,297 $ 86,233    
Money market funds 13,867 21,957    
Securities available for sale: 59,321 96,579    
Liability 143,766 215,126    
Cash and cash equivalents 75,464 74,662 69,413 37,035
Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 800 1,300    
Fair Value, Measurements, Recurring [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives 0 32    
Interest rate swaps 7,265      
Money market funds 15,084      
Funds held in trust account of Spokane Energy 1,600 1,600    
Total 96,467 128,860    
Foreign currency derivative liabilities at fair value 27      
Interest rate swaps 1,406 18,895    
Total 57,259 130,249    
Fair Value, Measurements, Recurring [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset 5,232 1,324    
Liability 33,275 98,496    
Fair Value, Measurements, Recurring [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset   0    
Liability 2,379 1,688    
Fair Value, Measurements, Recurring [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset 0 0    
Liability 18,692 9,910    
Fair Value, Measurements, Recurring [Member] | Power Option Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 1,480 1,260    
Fair Value, Measurements, Recurring [Member] | U.S. Government Agency [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 48,496 74,893    
Fair Value, Measurements, Recurring [Member] | Municipal [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 848 425    
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - financial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 5,026 11,154    
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - industrial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 3,936 6,518    
Fair Value, Measurements, Recurring [Member] | Corporate Fixed Income - Utility [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   2,092    
Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 1,015 1,497    
Fair Value, Measurements, Recurring [Member] | Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 2,010 [1] 2,116 [1]    
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 5,955 [1] 5,252 [1]    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Money market funds 15,084      
Funds held in trust account of Spokane Energy 1,600 1,600    
Total 24,649 30,925    
Total 0 0    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 2,010 [1] 2,116 [1]    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 5,955 [1] 5,252 [1]    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives 7      
Interest rate swaps 7,265      
Total 148,233 177,182    
Foreign currency derivative liabilities at fair value 34      
Interest rate swaps 1,406 18,895    
Total 120,830 196,638    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset 81,640 80,571    
Liability 119,390 177,743    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government Agency [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 48,496 74,893    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 848 425    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate fixed income - financial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 5,026 11,154    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate fixed income - industrial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 3,936 6,518    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Fixed Income - Utility [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   2,092    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Certificates of deposits [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 1,015 1,497    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total 385 5,630    
Total 22,936 18,488    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset   956    
Liability 2,379 2,644    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset 385 4,674    
Liability 19,077 14,584    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Option Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 1,480 1,260    
Fair Value, Measurements, Recurring [Member] | Counterparty Netting [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives (7) [2] 0 [2]    
Total (76,800) [2] (84,877) [2]    
Foreign currency derivative liabilities at fair value (7)      
Total (86,507) [2] (84,877) [2]    
Fair Value, Measurements, Recurring [Member] | Counterparty Netting [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset (76,408) [2] (79,247) [2]    
Liability (86,115) [2] (79,247) [2]    
Fair Value, Measurements, Recurring [Member] | Counterparty Netting [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset   (956) [2]    
Liability   (956) [2]    
Fair Value, Measurements, Recurring [Member] | Counterparty Netting [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset (385) (4,674) [2]    
Liability $ (385) $ (4,674) [2]    
[1] These assets are trading securities and are included in other property and investments-net on the Consolidated Balance Sheets.
[2] The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.