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Major Lessees (Tables)
 12 Months Ended
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
%