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FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 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 $ 83,878 $ 129,213 $ 41,159 $ 195,127
Total gains / (losses) (realized or unrealized):        
Included in earnings 20,766 56,990 33,822 183,418
Included in other comprehensive income (18,432) (85,466) 24,287 (153,008)
Settlements (20,766) (55,915) (33,822) (181,100)
Transfers in and/or out of level 3       385
Balance at end of period 65,446 44,822 65,446 44,822
Derivative disclosures        
Transfers between Level 1 and Level 2 measurements 0 0 0 0
Natural Gas Revenues
       
Derivative disclosures        
Unrealized gain (loss) included in natural gas revenues $ 0 $ (149) $ 0 $ (449)