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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2014
Long-term Purchase Commitment [Table Text Block] |
| Amount of Commitment Expiration Per Period
| Total Amounts Committed |  | Less Than 1 Year |  | 1-3 Years |  | 3-5 Years |  | Beyond 5 Years
Letters of Credit: |  |  |  |  |  |  |  |  |
Employee-Related | $ | 150,042 |  |  | $ | 124,536 |  |  | $ | 25,506 |  |  | $ | — |  |  | $ | — |
Environmental | 5,509 |  |  | 5,509 |  |  | — |  |  | — |  |  | — |
Other | 149,097 |  |  | 141,337 |  |  | 7,760 |  |  | — |  |  | — |
Total Letters of Credit | 304,648 |  |  | 271,382 |  |  | 33,266 |  |  | — |  |  | — |
Surety Bonds: |  |  |  |  |  |  |  |  |
Employee-Related | 223,579 |  |  | 223,579 |  |  | — |  |  | — |  |  | — |
Environmental | 598,877 |  |  | 598,877 |  |  | — |  |  | — |  |  | — |
Other | 24,437 |  |  | 24,436 |  |  | — |  |  | — |  |  | 1 |
Total Surety Bonds | 846,893 |  |  | 846,892 |  |  | — |  |  | — |  |  | 1 |
Guarantees: |  |  |  |  |  |  |  |  |
Coal | 133,600 |  |  | 100,200 |  |  | 33,400 |  |  | — |  |  | — |
Other | 61,571 |  | 34,974 |  | 8,822 |  | 8,367 |  | 9,408
Total Guarantees | 195,171 |  |  | 135,174 |  |  | 42,222 |  |  | 8,367 |  |  | 9,408 |
Total Commitments | $ | 1,346,712 |  |  | $ | 1,253,448 |  |  | $ | 75,488 |  |  | $ | 8,367 |  |  | $ | 9,409 |
Unrecorded Unconditional Purchase Obligations Disclosure | . These purchase obligations are not recorded on the Consolidated Balance Sheets. As of December 31, 2014, the purchase obligations for each of the next five years and beyond were as follows:
Obligations Due | Amount
Less than 1 year | $ | 250,471 |
1 - 3 years | 338,312 |
3 - 5 years | 181,608 |
More than 5 years | 455,414 |
Total Purchase Obligations | $ | 1,225,805 |

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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- Definition Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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