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Major Lessees (Tables) | 12 Months Ended
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Dec. 31, 2015
Leases [Abstract] |
Revenues from Lessees that Exceeded Ten Percent of Total Revenues and Other Income | Revenues from lessees that exceeded ten percent of total revenues and other income for any of the periods presented below are as follows (in thousands except for percentages):
|  | For the Years Ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | Revenues |  | Percent |  | Revenues |  | Percent |  | Revenues |  | Percent
Foresight Energy |  | $ | 86,614 |  |  | 17.7 | % |  | $ | 81,546 |  |  | 20.4 | % |  | $ | 88,432 |  |  | 24.7 | %
Alpha Natural Resources |  | $ | 34,364 |  |  | 7.0 | % |  | $ | 48,783 |  |  | 12.2 | % |  | $ | 55,147 |  |  | 15.4 | %

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