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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The financial instruments measured at fair value on a recurring basis are summarized below:
 
Fair Value Measurements at March 31, 2017
 
Fair Value Measurements at December 31, 2016
Description

(Level 1)
 

(Level 2)
 

(Level 3)
 

(Level 1)
 

(Level 2)
 

(Level 3)
Gas Derivatives
$
—

 
$
(163,515
)
 
$
—

 
$
—

 
$
(188,156
)
 
$
—

Murray Energy Guarantees
$
—

 
$
—

 
$
(1,285
)
 
$
—

 
$
—

 
$
(1,362
)
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]
 
March 31, 2017
 
December 31, 2016
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Cash and Cash Equivalents
$
61,266

 
$
61,266

 
$
60,475

 
$
60,475

Long-Term Debt
$
2,647,857

 
$
2,628,205

 
$
2,752,371

 
$
2,717,582