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FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy |  |  |  |
Balance at beginning of period | $ (29,899) | $ 218,942 | $ 41,159 | $ 195,127
Total Gains or (Losses) (Realized or Unrealized): |  |  |  |
Included in Earnings | (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
Natural Gas Revenues |  |  |  |
Derivative disclosures |  |  |  |
Unrealized gain (loss) included in natural gas revenues | $ 0 | $ (342) | $ 0 | $ (300)

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- Definition Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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