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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Successor | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) $ (17)   $ 18  
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) 0   0  
Successor | Designated as Hedging Instrument | Coal sales | Coal Contract | Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) (169)   100  
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) 0   0  
Successor | Designated as Hedging Instrument | Coal purchases | Coal Contract | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) 152   (82)  
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion) 0   0  
Successor | Not Designated as Hedging Instrument | Coal Contract | Change in fair value of coal derivatives and coal trading activities, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (212)   (186)  
Successor | Not Designated as Hedging Instrument | Coal Contract | Other operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives 0   0  
Successor | Not Designated as Hedging Instrument | Natural gas — unrealized | Change in fair value of coal derivatives and coal trading activities, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (120)   (616)  
Successor | Not Designated as Hedging Instrument | Heating oil — diesel purchases | Other operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Heating oil realized and unrealized gains and losses 822   (3,903)  
Successor | Not Designated as Hedging Instrument | Foreign currency | Other operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Heating oil realized and unrealized gains and losses $ 0   $ 0  
Predecessor | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)   $ (71)   $ (136)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)   76   397
Predecessor | Designated as Hedging Instrument | Coal sales | Coal Contract | Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)   (612)   (672)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)   108   1,634
Predecessor | Designated as Hedging Instrument | Coal purchases | Coal Contract | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)   541   536
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)   (32)   (1,237)
Predecessor | Not Designated as Hedging Instrument | Coal Contract | Change in fair value of coal derivatives and coal trading activities, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives   (566)   (1,662)
Predecessor | Not Designated as Hedging Instrument | Coal Contract | Other operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives   (133)   (476)
Predecessor | Not Designated as Hedging Instrument | Natural gas — unrealized | Change in fair value of coal derivatives and coal trading activities, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives   (79)   (463)
Predecessor | Not Designated as Hedging Instrument | Heating oil — diesel purchases | Other operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Heating oil realized and unrealized gains and losses   (770)   826
Predecessor | Not Designated as Hedging Instrument | Foreign currency | Other operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Heating oil realized and unrealized gains and losses   $ (314)   $ (451)