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ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (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
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |
Natural gas revenues | $ 341,901 |  | $ 231,896 |  | $ 1,004,085 |  | $ 639,729 |
Crude oil and condensate revenues | 84,209 |  | 57,870 |  | 220,090 |  | 165,317 |
Amortization of net loss | 70 | [1] | 79 | [1] | 319 | [1] | 8,428 | [1]
Income before income taxes | 115,736 |  | 59,556 |  | 334,530 |  | 148,885 |
Tax (expense) / benefit | (45,847) |  | (22,948) |  | (132,703) |  | (58,021) |
NET INCOME | 69,889 |  | 36,608 |  | 201,827 |  | 90,864 |
Amount Reclassified from Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |
Income before income taxes | 19,568 |  |  |  | 36,351 |  |  |
Tax (expense) / benefit | (7,696) |  |  |  | (14,298) |  |  |
NET INCOME | 11,872 |  |  |  | 22,053 |  |  |
Accumulated Net Gains / (Losses) on Cash Flow Hedges | Amount Reclassified from Accumulated Other Comprehensive Income | Commodity contracts |  |  |  |  |  |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |
Natural gas revenues | 20,766 |  |  |  | 33,822 |  |  |
Crude oil and condensate revenues | (1,082) |  |  |  | 3,054 |  |  |
Accumulated Defined Benefit Pension and Postretirement Plans | Amount Reclassified from Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization of net loss | $ (116) |  |  |  | $ (525) |  |  |
[1] | Net of income taxes of $(46) and $(53) for the three months ended September 30, 2013 and 2012, respectively, and $(206) and $(5,347) for the nine months ended September 30, 2013 and 2012, respectively.

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