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Fair Value (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset $ 94,598 $ 89,297    
Securities available for sale: 75,477 59,321    
Liability 115,001 143,766    
Cash and cash equivalents 91,979 75,464 82,952 74,662
Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 800      
Fair Value, Measurements, Recurring [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives 19 0    
Interest rate swaps 25,178 7,265    
Money Market Funds, Fair Value 3,238 15,084    
Funds held in trust account of Spokane Energy 1,600 1,600    
Total 117,277 96,467    
Foreign currency derivative liabilities at fair value 1 27    
Interest rate swaps 471 1,406    
Total 38,910 57,259    
Fair Value, Measurements, Recurring [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 3,723 5,232    
Liability 20,440 33,275    
Fair Value, Measurements, Recurring [Member] | Power Option Agreement [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 761 1,480    
Fair Value, Measurements, Recurring [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 1,193 2,379    
Fair Value, Measurements, Recurring [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 0 0    
Liability 16,044 18,692    
Fair Value, Measurements, Recurring [Member] | U.S. Government Agency [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 66,165 48,496    
Fair Value, Measurements, Recurring [Member] | Municipal [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 3,542 848    
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - financial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 3,004 5,026    
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - industrial [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 1,766 3,936    
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 1,015    
Fair Value, Measurements, Recurring [Member] | Fixed Income Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 1,829 [1] 2,010 [1]    
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deferred compensation assets: 6,213 [1] 5,955 [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 3,238 15,084    
Funds held in trust account of Spokane Energy 1,600 1,600    
Total 12,880 24,649    
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: 1,829 [1] 2,010 [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: 6,213 [1] 5,955 [1]    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives 19 7    
Interest rate swaps 25,178 7,265    
Total 170,008 148,233    
Foreign currency derivative liabilities at fair value 1 34    
Interest rate swaps 471 1,406    
Total 96,936 120,830    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 69,334 81,640    
Liability 96,464 119,390    
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: 66,165 48,496    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities available for sale: 3,542 848    
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: 3,004 5,026    
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: 1,766 3,936    
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 1,015    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total 67 385    
Total 18,065 22,936    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Option Agreement [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 761 1,480    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability 1,193 2,379    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Exchange Agreements [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset 67 385    
Liability 16,111 19,077    
Fair Value, Measurements, Recurring [Member] | Netting [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Foreign currency derivatives 0 [2] (7) [2]    
Total (65,678) [2] (76,800) [2]    
Foreign currency derivative liabilities at fair value 0 (7)    
Total (76,091) [2] (86,507) [2]    
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Energy commodity derivatives [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gross Asset (65,611) [2] (76,408) [2]    
Liability (76,024) [2] (86,115) [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 (67) (385) [2]    
Liability $ (67) $ (385) [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.