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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | The Partnership's intangible assets consist of the following (in thousands):
| December 31, 2015 |  | December 31, 2014
Contract intangibles | $ | 81,109 |  |  | $ | 82,972 |
Other intangibles | 5,076 |  |  | 3,004 |
Less accumulated amortization | (29,258 | ) |  | (25,243 | )
Total intangible assets, net | $ | 56,927 |  |  | $ | 60,733 |
Estimated Amortization Expense | The estimates of amortization expense for the periods as indicated below are based on current mining plans and are subject to revision as those plans change in future periods.
For the Year Ended December 31, |  | Estimated Amortization Expense
|  | (in thousands)
2016 |  | $ | 3,544 |
2017 |  | 3,095 |
2018 |  | 3,108 |
2019 |  | 3,108 |
2020 |  | 3,108 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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