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Commitments and Contingencies (Details 1) T in Millions, AUD in Millions | 3 Months Ended | 12 Months Ended | 264 Months Ended | 336 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 USD ($) | Jun. 30, 2012 USD ($) T | Sep. 30, 2011 USD ($) T | Dec. 31, 2016 USD ($) | Dec. 31, 2016 AUD | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2032 yr | Dec. 31, 2042 | Dec. 31, 2016 AUD | Oct. 07, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 AUD | Jul. 31, 2011 USD ($) T
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 287,000,000 |  |  |
Take-or-pay Arrangement Terms Years (Maximum) |  |  |  |  |  |  |  |  |  |  | 26 |  |  |  |  |
Take-or-pay obligations |  |  |  | $ 1,596,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Take-or-pay Obligations Due In One Year |  |  |  | 209,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Leased coal reserves adjacent to NARM | T |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average bid price per mineable ton |  | 1.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual payments on coal reserves 2013 to 2016 |  |  |  | 247,900,000 |  | $ 247,900,000 | $ 247,900,000 |  |  |  |  |  |  |  |  |
Number Of Tons Of Coal In Which Company Was Named Winning Bidder Adjacent to Caballo | T |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 220
Bid Price Per Mineable Ton |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.95
Annual Coal Reserve Payments Pursuant To Belle Ayr North Lease |  |  |  |  |  | 42,100,000 | 42,100,000 | $ 42,100,000 | $ 42,100,000 |  |  |  |  |  |  |
Number Of Tons Of Coal In Which Company Was Named Winning Bidder In The Powder River Basin | T |  |  | 130 |  |  |  |  |  |  |  |  |  |  |  |  |
Bid Price Per Mineable Ton In The Powder River Basin |  |  | 1.10 |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Coal Reserve Payments Pursuant To Caballo West Lease |  |  |  |  |  | 28,600,000 | 28,600,000 | 28,600,000 | 28,600,000 |  |  |  |  |  |  |
Reimbursement for the difference in the federal coal lease payments made in 2011 | $ 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
number of annual true up payments | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual true up payments for the excess of the $1.10 bid price versus $0.95 under the transferred lease |  |  |  |  |  | $ 3,900,000 | 3,900,000 | $ 3,900,000 | $ 3,900,000 |  |  |  |  |  |  |
Federal Coal Lease Term Years | yr |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Capital Additions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitments for capital expenditures |  |  |  | 7,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Berenergy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement Damages Awarded to Plaintiff |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,100,000 |  |
Monto Coal Pty Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | AUD |  |  |  |  | AUD 15.6 |  |  |  |  |  |  |  |  |  |  |
Eagle Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  |  |  |  |  | $ 23,400,000 |  |  |  |  |  |  |  |  |
Wilkie Creek [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | AUD |  |  |  |  | AUD 113.1 |  |  |  |  |  |  |  |  |  |  |
Settlement charges total |  |  |  | $ 9,900,000 |  |  |  |  |  |  |  | AUD 13.0 |  |  | AUD 13.0 |

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