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FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2013
FAIR VALUE MEASUREMENTS |
Financial assets and liabilities measured at fair value on a recurring basis |
(In thousands) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | June 30, 2013 |
Assets |  |  |  |  |  |  |  |  |
Deferred compensation plan |  | $ | 11,416 |  | $ | — |  | $ | — |  | $ | 11,416 |
Derivative instruments |  | — |  | 3,729 |  | 83,878 |  | 87,607 |
Total assets |  | $ | 11,416 |  | $ | 3,729 |  | $ | 83,878 |  | $ | 99,023 |
Liabilities |  |  |  |  |  |  |  |  |
Deferred compensation plan |  | $ | 30,385 |  | $ | — |  | $ | — |  | $ | 30,385 |
Derivative instruments |  | — |  | — |  | — |  | — |
Total liabilities |  | $ | 30,385 |  | $ | — |  | $ | — |  | $ | 30,385 |
(In thousands) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | December 31, 2012 |
Assets |  |  |  |  |  |  |  |  |
Deferred compensation plan |  | $ | 10,608 |  | $ | — |  | $ | — |  | $ | 10,608 |
Derivative instruments |  | — |  | 9,473 |  | 41,351 |  | 50,824 |
Total assets |  | $ | 10,608 |  | $ | 9,473 |  | $ | 41,351 |  | $ | 61,432 |
Liabilities |  |  |  |  |  |  |  |  |
Deferred compensation plan |  | $ | 23,893 |  | $ | — |  | $ | — |  | $ | 23,893 |
Derivative instruments |  | — |  | — |  | 192 |  | 192 |
Total liabilities |  | $ | 23,893 |  | $ | — |  | $ | 192 |  | $ | 24,085 |
Fair Value of Financial Assets and Liabilities Classified as Level 3 |
|  | Three Months Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
(In thousands) |  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Balance at beginning of period |  | $ | (29,899 | ) | $ | 218,942 |  | $ | 41,159 |  | $ | 195,127 |
Total gains / (losses) (realized or unrealized): |  |  |  |  |  |  |  |  |
Included in earnings (1) |  | (272 | ) | 69,390 |  | 13,056 |  | 126,428 |
Included in other comprehensive income |  | 113,777 |  | (90,234 | ) | 42,719 |  | (67,541 | )
Settlements |  | 272 |  | (68,885 | ) | (13,056 | ) | (125,186 | )
Transfers in and/or out of level 3 |  | — |  | — |  | — |  | 385 |
Balance at end of period |  | $ | 83,878 |  | $ | 129,213 |  | $ | 83,878 |  | $ | 129,213 |
(1) There were no unrealized gains or losses for the three and six months ended June 30, 2013. Unrealized losses of $0.3 million for the three and six months ended June 30, 2012, respectively, were included in natural gas revenues in the Condensed Consolidated Statement of Operations.
Carrying amounts and fair values of long-term debt |
|  | June 30, 2013 |  | December 31, 2012 |
(In thousands) |  | Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value |
Total debt |  | $ | 1,142,000 |  | $ | 1,235,176 |  | $ | 1,087,000 |  | $ | 1,213,474 |
Current maturities |  | (75,000 | ) | (75,301 | ) | (75,000 | ) | (77,175 | )
Long-term debt, excluding current maturities |  | $ | 1,067,000 |  | $ | 1,159,875 |  | $ | 1,012,000 |  | $ | 1,136,299 |

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- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets or liabilities) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset or liability. + References No definition available. + Details
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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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