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Acquisitions Pro Forma Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2011 | Jun. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Business Acquisition [Line Items] |  |  |  |  |  |
Revenues | $ 34,939 | $ 50,585 |  |  | $ 184,463 |
Total operating costs and expenses | 43,303 | 42,364 |  |  | 119,348 | 129,234
Operating income (loss) | (8,364) | 8,221 |  |  | 65,115 | 22,227
Interest and investment income | (41) | 25 |  |  | 117 | 78
Income (loss) from operations before provision for income taxes | (8,405) | 8,246 |  |  | 65,232 | 22,305
Provision for income taxes | 1,938 | (1,889) |  |  | (16,303) | (9,343)
Net income (loss) including noncontrolling interests in operating subsidiaries | (6,467) | 6,357 |  |  | 48,929 | 12,962
Net (income) loss attributable to noncontrolling interests in operating subsidiaries | (152) | 257 |  |  | 63 | (646)
Net income (loss) attributable to Acacia Research Corporation | $ (6,619) | $ 6,614 |  |  | $ 48,992 | $ 12,316
Pro forma income (loss) per common share attributable to Acacia Research Corporation: Basic earnings (loss) per share | $ (0.14) |  | $ 0.16 | $ 0.31 | $ 1.04 |
Pro forma income (loss) per common share attributable to Acacia Research Corporation: Diluted earnings (loss) per share | $ (0.14) |  | $ 0.15 | $ 0.30 | $ 1.03 |
Weighted average number of shares outstanding, basic | 48,332,878 |  | 41,292,819 | 39,178,952 | 46,886,820 |
Weighted average number of shares outstanding, diluted | 48,332,878 |  | 42,857,880 | 40,733,813 | 47,795,819 |

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