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Unrecorded Unconditional Purchase Obligation (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,023,964  
Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 897,451  
More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 112,762  
More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 12,822  
Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 929  
Standby Letters of Credit [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 333,322  
Standby Letters of Credit [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 312,447  
Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 20,875  
Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Surety Bonds [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 649,088  
Surety Bonds [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 574,267  
Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 74,820  
Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 1  
Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Guarantees [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 41,554  
Guarantees [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 10,737  
Guarantees [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 17,067  
Guarantees [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 12,821  
Guarantees [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 929  
Employee Related Commitments [Member] | Standby Letters of Credit [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 84,086  
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 64,783  
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 19,303  
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Employee Related Commitments [Member] | Surety Bonds [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 112,560  
Employee Related Commitments [Member] | Surety Bonds [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 79,680  
Employee Related Commitments [Member] | Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 32,880  
Employee Related Commitments [Member] | Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Employee Related Commitments [Member] | Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Environment Related Commitments [Member] | Standby Letters of Credit [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 998  
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 398  
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 600  
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Environment Related Commitments [Member] | Surety Bonds [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 516,349  
Environment Related Commitments [Member] | Surety Bonds [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 475,312  
Environment Related Commitments [Member] | Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 41,037  
Environment Related Commitments [Member] | Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Environment Related Commitments [Member] | Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Other Commitments [Member] | Standby Letters of Credit [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 248,238  
Other Commitments [Member] | Standby Letters of Credit [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 247,266  
Other Commitments [Member] | Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 972  
Other Commitments [Member] | Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Other Commitments [Member] | Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Other Commitments [Member] | Surety Bonds [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 20,179  
Other Commitments [Member] | Surety Bonds [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 19,275  
Other Commitments [Member] | Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 903  
Other Commitments [Member] | Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 1  
Other Commitments [Member] | Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 0  
Other Commitments [Member] | Guarantees [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 41,554  
Other Commitments [Member] | Guarantees [Member] | Balance on First Anniversary [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 10,737  
Other Commitments [Member] | Guarantees [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 17,067  
Other Commitments [Member] | Guarantees [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 12,821  
Other Commitments [Member] | Guarantees [Member] | Beyond Five Years of Balance Sheet Date [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 929  
Murray Energy [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Contractual Obligation 1,285 $ 1,362
Purchase Commitment [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Less than 1 year 204,580  
1 - 3 years 280,593  
3 - 5 years 243,595  
More than 5 years 598,135  
Total Purchase Obligations $ 1,326,903