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Derivatives (Effects Of Derivatives On Measures Of Financial Performance) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) $ 1,075 $ 1,408 $ 6,126 $ 2,644
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) 3,599 892 6,807 1,346
Designated as Hedging Instrument [Member] | Coal Contract [Member] | Coal sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) 3,636 3,449 12,738 4,806
Designated as Hedging Instrument [Member] | Coal Contract [Member] | Coal sales [Member] | Sales Revenue, Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) 6,683 1,639 12,555 2,568
Designated as Hedging Instrument [Member] | Coal Contract [Member] | Coal purchases [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) (2,561) (2,041) (6,612) (2,162)
Designated as Hedging Instrument [Member] | Coal Contract [Member] | Coal purchases [Member] | Cost of Sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) (3,084) (747) (5,748) (1,222)
Not Designated as Hedging Instrument [Member] | Coal Contract [Member] | Change in Fair Value of Coal Derivatives and Coal Trading Activity, Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (809) 1,610 (2,095) 455
Not Designated as Hedging Instrument [Member] | Coal Contract [Member] | Other Operating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives 511 502 2,428 4,699
Not Designated as Hedging Instrument [Member] | Natural Gas [Member] | Change in Fair Value of Coal Derivatives and Coal Trading Activity, Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (16) 238 (78) (21)
Not Designated as Hedging Instrument [Member] | Heating Oil-Diesel Purchases [Member] | Other Operating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Heating oil realized and unrealized gains and losses (5,525) (3,746) (7,262) (6,709)
Not Designated as Hedging Instrument [Member] | Heating Oil-Fuel Surcharges [Member] | Other Operating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Heating oil realized and unrealized gains and losses 0 (104) 0 (405)
Not Designated as Hedging Instrument [Member] | Foreign Currency [Member] | Other Operating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Heating oil realized and unrealized gains and losses $ (602) $ 0 $ (602) $ 0