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Discontinued Operations (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) T Rate | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Impairment of Long-Lived Assets to be Disposed of | $ 0 | $ 828,905 | $ 0
Fola/Miller Creek [Member] |  |  |
Cash Paid to Close Deal | 28,271 |  |
Escrow Deposits Related to Property Sales | 17,200 |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges | 53,130 |  |
Impairment of Long-Lived Assets to be Disposed of | $ 355,681 |  |
Buchanan and Other Assets [Member] |  |  |
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 |  |
Proceeds from Sale of Property Held-for-sale | $ 402,799 |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | $ (38,364) |  |

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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e957-107759 + Details
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