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CONSOLIDATED STATEMENT OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING REVENUES      
Natural gas $ 933,640 $ 796,517 $ 713,646
Crude oil and condensate 227,933 125,972 79,091
Brokered natural gas 34,005 51,190 65,281
Other 8,968 6,185 5,086
TOTAL OPERATING REVENUES 1,204,546 979,864 863,104
OPERATING EXPENSES      
Direct operations 118,243 107,409 99,642
Transportation and gathering 143,309 73,322 19,069
Brokered natural gas cost 28,502 43,834 56,466
Taxes other than income 48,874 27,576 37,894
Exploration 37,476 36,447 42,725
Depreciation, depletion and amortization 451,405 343,141 327,083
Impairment of oil and gas properties and other assets     40,903
General and administrative 121,239 104,667 79,177
TOTAL OPERATING EXPENSES 949,048 736,396 702,959
Gain/(loss) on sale of assets 50,635 63,382 106,294
INCOME FROM OPERATIONS 306,133 306,850 266,439
Interest expense and other 68,293 71,663 67,941
Income before income taxes 237,840 235,187 198,498
Income tax expense 106,110 112,779 95,112
NET INCOME $ 131,730 $ 122,408 $ 103,386
Earnings per share      
Basic (in dollars per share) $ 0.63 $ 0.59 $ 0.50
Diluted (in dollars per share) $ 0.62 $ 0.58 $ 0.49
Weighted-average common shares outstanding      
Basic (in shares) 209,538 208,498 207,823
Diluted (in shares) 210,993 210,761 210,390
Dividends per common share (in dollars per share) $ 0.08 $ 0.06 $ 0.06