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Segment Information | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Segment Information | Segment Information The Partnership's segments are strategic business units that offer products and services to different customer segments in different geographies within the U.S. and that are managed accordingly. NRP has the following four operating segments: Coal, Hard Mineral Royalty and Other—consists primarily of coal royalty, coal related transportation and processing assets, aggregate and industrial minerals royalty assets and timber. Our coal reserves are primarily located in Appalachia, the Illinois Basin and the Western United States. Our aggregates and industrial minerals are located in a number of states across the United States. Soda Ash—consists of the Partnership's 49% non-controlling equity interest in a trona ore mining operation and soda ash refinery in the Green River Basin, Wyoming. Ciner Resources LP, our operating partner, mines the trona, processes it into soda ash, and distributes the soda ash both domestically and internationally into the glass and chemicals industries. We receive regular quarterly distributions from this business. VantaCore—consists of our construction materials business acquired in October 2014 that operates hard rock quarries, an underground limestone mine, sand and gravel plants, asphalt plants and marine terminals. VantaCore operates in Pennsylvania, West Virginia, Tennessee, Kentucky and Louisiana. Oil and Gas—consists of our non-operated working interests, royalty interests and overriding royalty interests in oil and natural gas properties. Our primary interests in oil and natural gas producing properties are non-operated working interests located in the Williston Basin in North Dakota and Montana. We also own fee mineral, royalty or overriding royalty interests in oil and gas properties in several other regions, including the Appalachian Basin, Oklahoma and Louisiana. Direct segment costs and certain costs incurred at a corporate level that are identifiable and that benefit the Partnership's segments are allocated to the operating segments. These allocated costs include costs of: taxes, legal, information technology and shared facilities services and are included in Operating and maintenance expenses and Operating and maintenance expenses—affiliates on the Consolidated Statements of Comprehensive Income. Prior year general and administrative charges that are allocated to the operating segments have been reclassified to operating and maintenance expenses. Intersegment sales are at prices that approximate market. In reconciling items to consolidated operating income, Corporate and Financing includes functional corporate departments that do not earn revenues. Costs incurred by these departments include corporate headquarters and overhead, financing, centralized treasury and accounting and other corporate-level activity not specifically allocated to a segment. The following table summarizes certain financial information for each of the Partnership's operating segments (in thousands):
|  | Operating Segments |  |  |
For the Year Ended |  | Coal, Hard Mineral Royalty and Other |  | Soda Ash |  | VantaCore |  | Oil and Gas |  | Corporate and Financing |  | Total
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Revenues (including affiliates) |  | $ | 246,353 |  |  | $ | 49,918 |  |  | $ | 139,013 |  |  | $ | 53,565 |  |  | $ | — |  |  | $ | 488,849 |
Intersegment revenues (expenses) |  | 21 |  |  | — |  |  | (21 | ) |  | — |  |  | — |  |  | — |
Depreciation, depletion and amortization |  | 44,478 |  |  | — |  |  | 15,578 |  |  | 40,772 |  |  | — |  |  | 100,828 |
Asset impairment |  | 307,800 |  |  | — |  |  | 6,218 |  |  | 367,576 |  |  | — |  |  | 681,594 |
Interest expense, net |  | — |  |  | — |  |  | — |  |  | — |  |  | (93,809 | ) |  | (93,809 | )
Net income (loss) |  | (138,388 | ) |  | 49,918 |  |  | 272 |  |  | (377,365 | ) |  | (106,157 | ) |  | (571,720 | )
Capital expenditures |  | 428 |  |  | — |  |  | 14,039 |  |  | 30,457 |  |  | — |  |  | 44,924 |
Total assets at December 31, 2015 |  | 1,047,922 |  |  | 261,942 |  |  | 200,348 |  |  | 158,862 |  |  | 15,001 |  |  | 1,684,075 |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Revenues (including affiliates) |  | $ | 256,719 |  |  | $ | 41,416 |  |  | $ | 42,051 |  |  | $ | 59,566 |  |  | $ | — |  |  | $ | 399,752 |
Depreciation, depletion and amortization |  | 52,645 |  |  | — |  |  | 3,296 |  |  | 23,935 |  |  | — |  |  | 79,876 |
Asset impairment |  | 26,209 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 26,209 |
Interest expense, net |  | — |  |  | — |  |  | — |  |  | — |  |  | (80,089 | ) |  | (80,089 | )
Net income (loss) |  | 143,678 |  |  | 41,416 |  |  | 32 |  |  | 14,338 |  |  | (90,634 | ) |  | 108,830 |
Capital expenditures |  | 5,351 |  |  | — |  |  | 171,116 |  |  | 359,851 |  |  | — |  |  | 536,318 |
Total assets at December 31, 2014 |  | 1,403,762 |  |  | 264,020 |  |  | 219,658 |  |  | 540,713 |  |  | 16,571 |  |  | 2,444,724 |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Revenues (including affiliates) |  | $ | 306,851 |  |  | $ | 34,186 |  |  | $ | — |  |  | $ | 17,080 |  |  | $ | — |  |  | $ | 358,117 |
Depreciation, depletion and amortization |  | 58,502 |  |  | — |  |  | — |  |  | 5,875 |  |  | — |  |  | 64,377 |
Asset impairment |  | 734 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 734 |
Interest expense, net |  | — |  |  | — |  |  | — |  |  | — |  |  | (64,158 | ) |  | (64,158 | )
Net income (loss) |  | 211,590 |  |  | 34,186 |  |  | — |  |  | 5,198 |  |  | (78,896 | ) |  | 172,078 |
Capital expenditures |  | — |  |  | 293,085 |  |  | — |  |  | 75,019 |  |  | — |  |  | 368,104 |
Total assets at December 31, 2013 |  | 1,520,428 |  |  | 269,338 |  |  | — |  |  | 189,211 |  |  | 12,879 |  |  | 1,991,856 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 + Details
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