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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2014
Fair Value Disclosures [Abstract] |
Summary Of Assets And Liabilities Accounted At Fair Value On A Recurring Basis | The following tables summarize, by level within the fair value hierarchy, the Company's assets and liabilities that were accounted for at fair value on a recurring basis:
|  | September 30, 2014
|  | Level 1 |  | Level 2 |  | Total
Derivative instruments |  |  |  |  |  |
Risk management assets - Commodity forward contracts |  | $ | 428 |  |  | $ | 23 |  |  | $ | 451 |
Risk management liabilities - Commodity forward contracts |  | (119 | ) |  | (6,358 | ) |  | (6,477 | )
Available-for-sale marketable securities |  | 21,066 |  |  | — |  |  | 21,066 |
|  | December 31, 2013
|  | Level 1 |  | Level 2 |  | Total
Derivative instruments |  |  |  |  |  |
Risk management assets - Commodity forward contracts |  | $ | 48 |  |  | $ | 248 |  |  | $ | 296 |
Risk management liabilities - Commodity forward contracts |  | — |  |  | (176 | ) |  | (176 | )
Available-for-sale marketable securities |  | 91,595 |  |  | 147,793 |  |  | 239,388 |
Summary Of Carrying And Fair Values Of Long-Term Debt | The carrying and fair values of the Company's long-term debt are summarized in the table below. The Company's long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy.
|  | September 30, 2014 |  | December 31, 2013
|  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
3.60% senior notes due 2022 |  | $ | 249,079 |  |  | $ | 247,633 |  |  | $ | 248,990 |  |  | $ | 236,905 |
6 ½% senior notes due 2029 |  | 100,000 |  |  | 114,624 |  |  | 100,000 |  |  | 109,490 |
6 ¾% senior notes due 2032 |  | 250,000 |  |  | 275,313 |  |  | 250,000 |  |  | 265,148 |
6 ½% GO Zone Senior Notes Due 2035 |  | 89,000 |  |  | 101,855 |  |  | 89,000 |  |  | 94,606 |
6 ½% IKE Zone Senior Notes Due 2035 |  | 65,000 |  |  | 74,389 |  |  | 65,000 |  |  | 69,094 |
Loan related to tax-exempt waste disposal revenue bonds due 2027 |  | 10,889 |  |  | 10,889 |  |  | 10,889 |  |  | 10,889 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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