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Unrecorded Unconditional Purchase Obligation (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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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 |

X
- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than three and within four to five years from the balance sheet date. + References No definition available. + Details
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- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than one and within two to three years from the balance sheet date. + References No definition available. + Details
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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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