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Quarterly Financial Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 1,338,098 |  | $ 532,798 |  | $ 478,434 |  | $ 381,635 |  | $ 373,838 |  | $ 363,753 |  | $ 364,774 |  | $ 312,848 |  | $ 2,730,965 |  | $ 1,415,213 |  | $ 931,736 |
(Loss) income from operations | (209,690) | [1],[2] | (75,871) | [1],[2] | 762,413 | [1],[2] | (151,656) | [1],[2] | (339,457) | [3] | 696,582 | [3] | 279,716 | [3] | (207,828) | [3] | 325,196 | [4] | 429,013 | [4] | (6,786) | [4]
Net income (loss) | (294,529) | [1],[2],[5] | (159,752) | [1],[2],[5] | 917,076 | [1],[2],[5] | (216,224) | [1],[2],[5] | (394,448) | [3] | 636,004 | [3] | 223,170 | [3] | (302,338) | [3] | 246,571 |  | 162,388 |  | 195,010 |
(Loss applicable) income available to SandRidge Energy, Inc. common stockholders | $ (301,785) | [1],[2],[5] | $ (184,301) | [1],[2],[5] | $ 804,191 | [1],[2],[5] | $ (232,059) | [1],[2],[5] | $ (388,597) | [3] | $ 561,228 | [3] | $ 196,135 | [3] | $ (316,284) | [3] | $ 86,046 |  | $ 52,482 |  | $ 153,123 |
(Loss applicable) income available per share to SandRidge Energy, Inc., common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars) | $ (0.63) | [6] | $ (0.39) | [6] | $ 1.74 | [6] | $ (0.58) | [6] | $ (0.97) | [6] | $ 1.41 | [6] | $ 0.49 | [6] | $ (0.79) | [6] | $ 0.19 |  | $ 0.13 |  | $ 0.52 |
Diluted (in dollars) | $ (0.63) | [6] | $ (0.39) | [6] | $ 1.46 | [6] | $ (0.58) | [6] | $ (0.97) | [6] | $ 1.16 | [6] | $ 0.42 | [6] | $ (0.79) | [6] | $ 0.19 |  | $ 0.13 |  | $ 0.52 |
[1] | Includes unrealized losses (gains) of $129.2 million, $(580.7) million, $222.5 million and $19.3 million on commodity derivative contracts for the first, second, third and fourth quarters, respectively.
[2] | Includes a $235.4 million goodwill impairment and a $79.3 million impairment of gas treating plants and CO2 compression facilities in the fourth quarter of 2012.
[3] | Includes unrealized losses (gains) of $269.0 million, $(188.3) million, $(604.6) million and $429.1 million on commodity derivative contracts for the first, second, third and fourth quarters, respectively.
[4] | Exploration and production segment income from operations includes unrealized (gains) losses of $(209.7) million, $(94.8) million and $275.2 million on commodity derivative contracts for the years ended December 31, 2012, 2011 and 2010, respectively, and impairment of the Company’s goodwill of $235.4 million for the year ended December 31, 2012. For the year ended December 31, 2012, the loss from operations for the midstream services segment includes a $59.7 million impairment of the Company’s gas treating plants in west Texas and the loss from operations in the All Other column includes a $19.6 million impairment of the Company’s CO2 compression facilities.
[5] | Includes adjustments of $(4.8) million retrospectively applied to the second quarter of 2012 as a result of measurement period adjustments made to the preliminary purchase price allocation for the Dynamic Acquisition in the fourth quarter of 2012.
[6] | (Loss applicable) income available per share to common stockholders for each quarter is computed using the weighted-average number of shares outstanding during the quarter, while earnings per share for the fiscal year is computed using the weighted-average number of shares outstanding during the year. Thus, the sum of (loss applicable) income available per share to common stockholders for each of the four quarters may not equal the fiscal year amount.

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