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Derivatives (Effects Of Derivatives On Measures Of Financial Performance) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Successor | Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion) $ 15   $ 35  
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) 49   269  
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) (34)   (234)  
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 0   26  
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 (27)   (496)  
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 (1,147)   (4,725)  
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)   $ (67)   $ (65)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)   96   321
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)   (73)   (60)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)   157   1,526
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)   6   (5)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)   (61)   (1,205)
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   19   (1,096)
Predecessor | Not Designated as Hedging Instrument | Coal Contract | Other operating (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives   (180)   (343)
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   235   (384)
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   2,039   1,596
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   $ 34   $ (137)