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Long-Term Debt | 12 Months Ended
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Dec. 31, 2014
Long-term Debt, Unclassified [Abstract] |
Long-term Debt | LONG-TERM DEBT:
| December 31,
| 2014 |  | 2013
Debt: |  |  |
Senior notes due April 2017 at 8.00%, issued at par value | $ | — |  |  | $ | 1,500,000 |
Senior notes due April 2020 at 8.25%, issued at par value | 1,014,800 |  |  | 1,250,000 |
Senior notes due March 2021 at 6.375%, issued at par value | 250,000 |  |  | 250,000 |
Senior notes due April 2022 at 5.875% including Amortization of Bond Premium | 1,856,506 |  |  | — |
MEDCO revenue bonds in series due September 2025 at 5.75% | 102,865 |  |  | 102,865 |
Advance royalty commitments (7.91% and 7.93% weighted average interest rate for December 31, 2014 and 2013, respectively) | 13,473 |  |  | 11,182 |
Other long-term notes maturing at various dates through 2031 (total value of $4,473 and $5,923 less unamortized discount of $643 and $1,050 at December 31, 2014 and December 31,2013, respectively). | 3,830 |  |  | 4,873 |
| 3,241,474 |  |  | 3,118,920 |
Less amounts due in one year * | 5,052 |  |  | 2,957 |
Long-Term Debt | $ | 3,236,422 |  |  | $ | 3,115,963 |
* Excludes current portion of Capital Lease Obligations of $7,964 and $8,498 at December 31, 2014 and December 31, 2013, respectively. Annual undiscounted maturities on long-term debt during the next five years are as follows:
Year ended December 31, | Amount
2015 | $ | 4,480 |
2016 | 4,454 |
2017 | 2,944 |
2018 | 1,266 |
2019 | 904 |
Thereafter | 3,235,692 |
Total Long-Term Debt Maturities | $ | 3,249,740 |

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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