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Other Income (Notes)
3 Months Ended
Mar. 31, 2017
Component of Operating Income [Abstract]  
Other Income and Other Expense Disclosure [Text Block]
 
For the Three Months Ended
 
March 31,
 
2017
 
2016
Equity in Earnings of Affiliates - CONE
$
11,938

 
$
14,351

Rental Income
8,842

 
9,196

Royalty Income - Non-Operated Coal
8,785

 
2,230

Purchased Coal Sales
3,541

 

Gathering Revenue
3,153

 
2,748

Interest Income
1,543

 
214

Right of Way Issuance
1,001

 
15,733

Equity in Earnings of Affiliates - Other
392

 
2,314

Other
1,501

 
1,345

    Miscellaneous Other Income
$
40,696

 
$
48,131