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Discontinued Operations Statement
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
T
Rate
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash Paid to Close Deal $ 28,271    
Escrow Deposits Related to Property Sales $ 13,700    
Royalty Percent | Rate 20.00%    
Royalty Per Ton - Year 1 | T 75.00    
Royalty Per Ton - Year 2 | T 78.75    
Royalty Per Ton - Year 3 | T 82.69    
Royalty Per Ton - Year 4 | T 86.82    
Royalty Per Ton - Year 5 | T 91.16    
Royalty Revenue $ 8,785 $ 2,230  
Proceeds from Sale of Property Held-for-sale 402,799    
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 38,364    
Disposal Group, Including Discontinued Operation, Assets, Current 0   $ 83
Disposal Group, Including Discontinued Operation, Liabilities, Current 5,892   6,050
Coronado [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Royalty Revenue 5,262    
Buchanan and Other Assets [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal group, including discontinued operations, coal sales 0 76,519  
Disposal Group, Including Discontinued Operations, Cargo and Freight Revenue 0 1,012  
Disposal Group, Including Discontinued Operation, Other Income 0 43  
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 0 38,364  
Disposal Group, Including Discontinued Operation, Revenue 0 39,210  
Disposal Group, Including Discontinued Operation, Operating Expense 0 88,066  
Disposal Group, Including Discontinued Operation, Operating Income (Loss) 0 (48,856)  
Discontinued Operation, Tax Effect of Discontinued Operation 0 4,311  
Disposal Group, Including Discontinued Operation, Operating Income (Loss) 0 $ (53,167)  
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net 0   83
Disposal Group, Including Discontinued Operation, Assets, Current 0   83
Disposal Group, Including Discontinued Operation, Assets 0   83
Disposal Group, Including Discontinued Operation, Accounts Payable 0   36
Disposal Group, Including Discontinued Operation, Liabilities, Current 5,892   6,014
Disposal Group, Including Discontinued Operation, Liabilities $ 5,892   $ 6,050