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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
The effect of derivative instruments in cash flow hedging relationships on the Consolidated Statements of Income and the Consolidated Statements of Stockholders' Equity, net of tax, were as follows:
 
 
 
Year Ended December 31,
 
2014
2013
2012
Natural Gas Price Swaps and Options
 
 
 
Beginning Balance – Accumulated OCI

$
42,493

$
76,761

$
151,780

Gain recognized in Accumulated OCI
$
97,316

$
45,631

$
114,240

Less: Gain reclassified from Accumulated OCI into Outside Sales
$
18,288

$
79,899

$
189,259

Ending Balance – Accumulated OCI

$
121,521

$
42,493

$
76,761

Gain (Loss) recognized in Outside Sales for ineffectiveness 
$
4,168

$
(4,645
)
$
579