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Condensed Consolidating Financial Information (Condensed Consolidating Statement of Operations) (Details) (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenues from external customers $ 765,166 $ 589,943 $ 1,441,501 $ 1,258,060
Gas purchases - midstream services 200,052 141,792 370,282 299,460
Operating expenses 55,054 50,943 111,852 87,509
General and administrative expenses 40,238 36,633 77,355 69,577
Depreciation, depletion and amortization 171,620 144,006 335,067 283,023
Taxes, other than income taxes 15,660 10,252 31,752 24,084
Total operating costs and expenses 482,624 383,626 926,308 763,653
Operating Income 282,542 206,317 515,193 494,407
Other income (loss), net 69 (84) 443 (61)
Equity in earnings of subsidiaries 0 0 0 0
Interest expense 6,170 [1] 6,180 [1] 13,606 [1] 12,688 [1]
Income before income taxes 276,441 200,053 502,030 481,658
Provision (benefit) for income taxes 108,987 [1] 78,044 [1] 197,967 [1] 187,881 [1]
Net income 167,454 122,009 304,063 293,777
Less: Net Loss Attributable to noncontrolling interest 0 (60) 0 (89)
Net income (loss) attributable to Southwestern Energy 167,454 122,069 304,063 293,866
Parent [Member]
        
Revenues from external customers 0 0 0 0
Gas purchases - midstream services 0 0 0 0
Operating expenses 0 0 0 0
General and administrative expenses 0 0 0 0
Depreciation, depletion and amortization 0 0 0 0
Taxes, other than income taxes 0 0 0 0
Total operating costs and expenses 0 0 0 0
Operating Income 0 0 0 0
Other income (loss), net 0 0 0 0
Equity in earnings of subsidiaries 167,454 122,069 304,063 293,866
Interest expense 0 0 0 0
Income before income taxes 167,454 122,069 304,063 293,866
Provision (benefit) for income taxes 0 0 0 0
Net income 167,454 122,069 304,063 293,866
Less: Net Loss Attributable to noncontrolling interest 0 0 0 0
Net income (loss) attributable to Southwestern Energy 167,454 122,069 304,063 293,866
Guarantors [Member]
        
Revenues from external customers 728,430 561,762 1,370,273 1,204,589
Gas purchases - midstream services 200,420 142,269 371,002 300,285
Operating expenses 88,477 74,980 175,329 133,139
General and administrative expenses 35,298 32,104 67,342 60,229
Depreciation, depletion and amortization 161,699 136,640 316,100 269,015
Taxes, other than income taxes 13,568 8,858 27,475 21,447
Total operating costs and expenses 499,462 394,851 957,248 784,115
Operating Income 228,968 166,911 413,025 420,474
Other income (loss), net 16 (93) 361 (140)
Equity in earnings of subsidiaries 0 0 0 0
Interest expense 1,748 936 5,393 3,810
Income before income taxes 227,236 165,882 407,993 416,524
Provision (benefit) for income taxes 89,651 64,718 161,013 162,479
Net income 137,585 101,164 246,980 254,045
Less: Net Loss Attributable to noncontrolling interest 0 (60) 0 (89)
Net income (loss) attributable to Southwestern Energy 137,585 101,224 246,980 254,134
Non-Guarantors [Member]
        
Revenues from external customers 100,108 74,701 193,766 142,023
Gas purchases - midstream services 0 0 0 0
Operating expenses 28,793 21,759 56,777 41,604
General and administrative expenses 5,728 4,776 11,577 9,841
Depreciation, depletion and amortization 9,921 7,366 18,967 14,008
Taxes, other than income taxes 2,092 1,394 4,277 2,637
Total operating costs and expenses 46,534 35,295 91,598 68,090
Operating Income 53,574 39,406 102,168 73,933
Other income (loss), net 53 9 82 79
Equity in earnings of subsidiaries 0 0 0 0
Interest expense 4,422 5,244 8,213 8,878
Income before income taxes 49,205 34,171 94,037 65,134
Provision (benefit) for income taxes 19,336 13,326 36,954 25,402
Net income 29,869 20,845 57,083 39,732
Less: Net Loss Attributable to noncontrolling interest 0 0 0 0
Net income (loss) attributable to Southwestern Energy 29,869 20,845 57,083 39,732
Eliminations [Member]
        
Revenues from external customers (63,372) (46,520) (122,538) (88,552)
Gas purchases - midstream services (368) (477) (720) (825)
Operating expenses (62,216) (45,796) (120,254) (87,234)
General and administrative expenses (788) (247) (1,564) (493)
Depreciation, depletion and amortization 0 0 0 0
Taxes, other than income taxes 0 0 0 0
Total operating costs and expenses (63,372) (46,520) (122,538) (88,552)
Operating Income 0 0 0 0
Other income (loss), net 0 0 0 0
Equity in earnings of subsidiaries (167,454) (122,069) (304,063) (293,866)
Interest expense 0 0 0 0
Income before income taxes (167,454) (122,069) (304,063) (293,866)
Provision (benefit) for income taxes 0 0 0 0
Net income (167,454) (122,069) (304,063) (293,866)
Less: Net Loss Attributable to noncontrolling interest 0 0 0 0
Net income (loss) attributable to Southwestern Energy $ (167,454) $ (122,069) $ (304,063) $ (293,866)
[1] (1) Interest income, interest expense and the provision for income taxes by segment are allocated as they are incurred at the corporate level.