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Supplementary Unrestricted Subsidiary Information - CONDENSED CONSOLIDATING BALANCE SHEETS (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
ASSETS |  |  |
Current assets (including affiliates) | $ 121,129 | $ 136,118 |
Mineral rights, net | 1,094,027 | 1,781,852 |
Equity in unconsolidated investment | 261,942 | 264,020 |
Other non-current assets (including affiliates) | 206,977 | 262,734 |
Total assets | 1,684,075 | 2,444,724 | $ 1,991,856
LIABILITIES AND CAPITAL |  |  |
Current portion of long-term debt, net | 80,983 | 80,983 |
Other current liabilities (including affiliates) | 55,664 | 66,948 |
Long-term debt, net (including affiliate) | 1,304,013 | 1,394,240 |
Other non-current liabilities (including affiliates) | 170,473 | 182,398 |
Partners' capital | 76,336 | 720,805 |
Non-controlling interest | (3,394) | (650) |
Total liabilities and capital | 1,684,075 | 2,444,724 |
Unrestricted Subsidiaries of NRP |  |  |
ASSETS |  |  |
Current assets (including affiliates) | 21,540 | 23,842 |
Mineral rights, net | 134,445 | 446,938 |
Equity in unconsolidated investment | 0 | 0 |
Other non-current assets (including affiliates) | 2,287 | 4,156 |
Total assets | 158,272 | 474,936 |
LIABILITIES AND CAPITAL |  |  |
Current portion of long-term debt, net | 0 | 0 |
Other current liabilities (including affiliates) | 7,351 | 16,212 |
Long-term debt, net (including affiliate) | 85,000 | 110,000 |
Other non-current liabilities (including affiliates) | 4,703 | 5,193 |
Partners' capital | 64,663 | 344,232 |
Non-controlling interest | (3,445) | (701) |
Total liabilities and capital | 158,272 | 474,936 |
NRP and its Restricted Subsidiaries |  |  |
ASSETS |  |  |
Current assets (including affiliates) | 99,589 | 112,276 |
Mineral rights, net | 959,582 | 1,334,914 |
Equity in unconsolidated investment | 261,942 | 264,020 |
Other non-current assets (including affiliates) | 204,690 | 258,578 |
Total assets | 1,525,803 | 1,969,788 |
LIABILITIES AND CAPITAL |  |  |
Current portion of long-term debt, net | 80,983 | 80,983 |
Other current liabilities (including affiliates) | 48,313 | 50,736 |
Long-term debt, net (including affiliate) | 1,219,013 | 1,284,240 |
Other non-current liabilities (including affiliates) | 165,770 | 177,205 |
Partners' capital | 11,673 | 376,573 |
Non-controlling interest | 51 | 51 |
Total liabilities and capital | $ 1,525,803 | $ 1,969,788 |

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