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Discontinued Operations Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Impairment of Long-Lived Assets to be Disposed of $ 0 $ 828,905 $ 0
Buchanan and Other Assets [Member]      
Disposal group, including discontinued operations, coal sales 102,904 367,234 426,263
Disposal Group, Including Discontinued Operations, Cargo and Freight Revenue 1,322 5,098 5,015
Disposal Group, Including Discontinued Operation, Other Income 740 51 2,635
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax (91,785) 336 (6,640)
Disposal Group, Including Discontinued Operation, Revenue 13,181 372,719 427,273
Disposal Group, Including Discontinued Operation, Operating Expense 134,248 395,913 431,344
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax (121,067) (23,194) (4,071)
Impairment of Long-Lived Assets to be Disposed of 355,681 0 0
Discontinued Operation, Tax Effect of Discontinued Operation (173,565) (8,985) (2,214)
Disposal Group, Including Discontinued Operation, Operating Income (Loss) $ (303,183) $ (14,209) $ (1,857)