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Discontinued Operations (Details) - Buchanan and Other Assets [Member]
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Coal Revenue $ 316,448
Other Outside Sales 12,886
Freight-Outside Coal 12,282
Miscellaneous Other Income 17,396
Gain on Sale of Assets 7,955
Total Revenue and Other Income 366,967
Total Costs 315,829
Income From Operations Before Income Taxes 51,138
Income Tax Benefit (6,367)
Less: Net Income Attributable to Noncontrolling Interest 5,464
Income From Discontinued Operations, net $ 52,041