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Equity Investment | 12 Months Ended
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Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract] |
Equity Investment | Equity Investment We account for our 49% investment in Ciner Wyoming LLC ("Ciner Wyoming", and formerly "OCI Wyoming LLC") using the equity method of accounting. Ciner Wyoming distributed $46.8 million, $46.6 million and $72.9 million to us in the year ended December 31, 2015, 2014 and 2013, respectively. The difference between the amount at which the investment in Ciner Wyoming is carried and the amount of underlying equity in Ciner Wyoming's net assets was $154.8 million and $162.7 million as of December 31, 2015 and 2014, respectively. This excess basis relates to plant, property and equipment and right to mine assets. The excess basis difference that relates to property, plant and equipment is being amortized into income using the straight-line method over a weighted average of 28 years. The excess basis difference that relates to right to mine assets is being amortized into income using the units of production method. Our equity in the earnings of Ciner Wyoming is summarized as follows (in thousands):
| For the Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Income allocation to NRP’s equity interests | $ | 54,709 |  |  | $ | 47,354 |  |  | $ | 37,036 |
Amortization of basis difference | (4,791 | ) |  | (5,938 | ) |  | (2,850 | )
Equity in earnings of unconsolidated investment | $ | 49,918 |  |  | $ | 41,416 |  |  | $ | 34,186 |
The results of Ciner Wyoming’s operations are summarized as follows (in thousands):
| For the Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Sales | $ | 486,393 |  |  | $ | 465,032 |  |  | $ | 442,132 |
Gross profit | 131,493 |  |  | 118,439 |  |  | 94,299 |
Net Income | 111,650 |  |  | 96,640 |  |  | 79,655 |
The financial position of Ciner Wyoming is summarized as follows (in thousands):
| For the Year Ended December 31,
| 2015 |  | 2014
Current assets | $ | 144,695 |  |  | $ | 179,851 |
Noncurrent assets | 233,845 |  |  | 223,053 |
Current liabilities | 43,018 |  |  | 47,704 |
Noncurrent liabilities | 116,808 |  |  | 149,192 |

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=49116238&loc=d3e32847-111569 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=49116238&loc=d3e32787-111569 + Details
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