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MISCELLANEOUS OTHER INCOME (Tables)
 6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
Schedule of Miscellaneous Other Income
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Royalty Income - Non-Operated Coal
$
4,142

 
$
3,496

 
$
13,948

 
$
12,193

Purchased Coal Sales
3,742

 
2,557

 
12,488

 
6,098

Rental Income
1,048

 
2,606

 
2,170

 
11,133

Interest Income
467

 
457

 
1,068

 
1,047

Property Easements and Option Income
259

 
602

 
4,410

 
994

Other
711

 
427

 
2,172

 
1,329

Miscellaneous Other Income
$
10,369

 
$
10,145

 
$
36,256

 
$
32,794