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Derivatives (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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