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Fair Value (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset $ 91,163 $ 89,132    
Securities available for sale:   69,361    
Liability 105,781 89,675    
Cash and cash equivalents 207,967 82,574 85,411 75,464
Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 900 700    
Fair Value, Measurements, Recurring [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives 135 1    
Interest rate swaps 11,751 33,543    
Money Market Funds, Fair Value   11,180    
Funds held in trust account of Spokane Energy 1,600 1,600    
Total 32,933 127,991    
Foreign currency derivative liabilities at fair value 0 0    
Interest rate swaps 13,651      
Total 27,557 29,231    
Fair Value, Measurements, Recurring [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 11,144 3,876    
Liability 3,199 12,796    
Fair Value, Measurements, Recurring [Member] | Power Option Agreement [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 605 775    
Fair Value, Measurements, Recurring [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 2,183 1,219    
Fair Value, Measurements, Recurring [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 0 0    
Liability 7,919 14,441    
Fair Value, Measurements, Recurring [Member] | U.S. Government Agency [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   61,078    
Fair Value, Measurements, Recurring [Member] | Municipal [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   3,518    
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - financial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   3,000    
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - industrial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   765    
Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   1,000    
Fair Value, Measurements, Recurring [Member] | Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 1,879 [1] 1,960 [1]    
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 6,424 [1] 6,470 [1]    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Money Market Funds, Fair Value   11,180    
Funds held in trust account of Spokane Energy 1,600 1,600    
Total 9,903 21,210    
Total 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 1,879 [1] 1,960 [1]    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 6,424 [1] 6,470 [1]    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives 136 7    
Interest rate swaps 15,637 33,543    
Total 88,755 158,154    
Foreign currency derivative liabilities at fair value 1 6    
Interest rate swaps 24,577      
Total 92,666 72,901    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 72,982 55,243    
Liability 68,088 72,895    
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:   61,078    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale:   3,518    
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:   3,000    
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:   765    
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:   1,000    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total 2,408 339    
Total 13,115 16,774    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Option Agreement [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 605 775    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 2,183 1,219    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 2,408 339    
Liability 10,327 14,780    
Fair Value, Measurements, Recurring [Member] | Netting [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives (1) [2] (6) [2]    
Interest rate swaps (3,886)      
Total (68,133) [2] (51,712) [2]    
Foreign currency derivative liabilities at fair value (1) (6)    
Interest rate swaps (10,926)      
Total (78,224) [2] (60,444) [2]    
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset (61,838) [2] (51,367) [2]    
Liability (64,889) [2] (60,099) [2]    
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability   0 [2]    
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset (2,408) (339) [2]    
Liability $ (2,408) $ (339) [2]    
[1] These assets are trading securities and are included in other property and investments-net on the Condensed 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.