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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