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Debt and Debt - Affiliate (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Long-Term Debt | As of December 31, 2015 and 2014, Debt and debt—affiliate consisted of the following (in thousands):
| December 31, 2015 |  | December 31, 2014
NRP LP Debt: |  |  |
$425 million 9.125% senior notes, with semi-annual interest payments in April and October, due October 2018, $300 million issued at 99.007% and $125 million issued at 99.5% | $ | 422,923 |  |  | $ | 422,167 |
Opco Debt: |  |  |
$300 million floating rate revolving credit facility, due October 2017 | 290,000 |  |  | — |
$300 million floating rate revolving credit facility, due August 2016 | — |  |  | 200,000 |
$200 million floating rate term loan, due January 2016 | — |  |  | 75,000 |
4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, due June 2018 | 13,850 |  |  | 18,467 |
8.38% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, due March 2019 | 85,714 |  |  | 107,143 |
5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, due July 2020 | 38,462 |  |  | 46,154 |
5.31% utility local improvement obligation, with annual principal and interest payments in February, due March 2021 | 1,153 |  |  | 1,345 |
5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, due June 2023 | 21,600 |  |  | 24,300 |
4.73% senior notes, with semi-annual interest payments in June and December, with annual principal payments in December, due December 2023 | 60,000 |  |  | 67,500 |
5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024 | 135,000 |  |  | 150,000 |
8.92% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024 | 40,909 |  |  | 45,455 |
5.03% senior notes, with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026 | 148,077 |  |  | 161,538 |
5.18% senior notes, with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026 | 42,308 |  |  | 46,154 |
NRP Oil and Gas Debt: |  |  |
Reserve-based revolving credit facility due November 2019 | 85,000 |  |  | 110,000 |
Total debt and debt—affiliate | 1,384,996 |  |  | 1,475,223 |
Less: current portion of long-term debt, net | (80,983 | ) |  | (80,983 | )
Total long-term debt and debt—affiliate | $ | 1,304,013 |  |  | $ | 1,394,240 |
Principal Payments Due | The consolidated principal payments due are set forth below (in thousands):
| NRP LP |  |  |  | Opco | NRP Oil and Gas |  |
| Senior Notes |  |  |  | Senior Notes |  | Credit Facility |  | Credit Facility |  | Total
2016 | $ | — |  |  |  |  | $ | 80,983 |  |  | $ | — |  |  | $ | — |  |  | $ | 80,983 |
2017 | — |  |  |  |  | 80,983 |  |  | 290,000 |  |  | — |  |  | 370,983 |
2018 | 425,000 |  |  | (1 | ) |  | 80,983 |  |  | — |  |  | — |  |  | 505,983 |
2019 | — |  |  |  |  | 76,366 |  |  | — |  |  | 85,000 |  |  | 161,366 |
2020 | — |  |  |  |  | 54,938 |  |  | — |  |  | — |  |  | 54,938 |
Thereafter | — |  |  |  |  | 212,820 |  |  | — |  |  | — |  |  | 212,820 |
| $ | 425,000 |  |  |  |  |  | $ | 587,073 |  |  | $ | 290,000 |  |  | $ | 85,000 |  |  | $ | 1,387,073 |
(1) | The 9.125% senior notes due 2018 were issued at a discount and as of December 31, 2015 were carried at $422.9 million.

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