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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2014
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 June 30, 2014
 
Fair Value Measurements at December 31, 2013
Description
Quoted Prices in
Active Markets
for Identical
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Quoted Prices in
Active Markets
for Identical
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Gas Cash Flow Hedges
$
—

 
$
8,761

 
$
—

 
$
—

 
$
65,449

 
$
—

Murray Energy Guarantees
$
—

 
$
—

 
$
3,000

 
$
—

 
$
—

 
$
3,000
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]
 
June 30, 2014
 
December 31, 2013
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Cash and Cash Equivalents
$
147,393

 
$
147,393

 
$
327,420

 
$
327,420

Long-Term Debt
$
(3,218,448
)
 
$
(3,430,827
)
 
$
(3,118,920
)
 
$
(3,299,875
)