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Acquisitions Pro Forma Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 50,484 | $ 39,746 | $ 149,524 | $ 100,876
Total operating costs and expenses | 40,711 | 41,893 | 76,045 | 86,870
Operating income (loss) | 9,773 | (2,147) | 73,479 | 14,006
Interest and investment income | 102 | 24 | 158 | 53
Income (loss) from operations before provision for income taxes | 9,875 | (2,123) | 73,637 | 14,059
Provision for income taxes | (3,494) | (306) | (18,241) | (7,454)
Net income (loss) including noncontrolling interests in operating subsidiaries | 6,381 | (2,429) | 55,396 | 6,605
Net (income) loss attributable to noncontrolling interests in operating subsidiaries | (60) | 300 | 215 | (903)
Net income (loss) attributable to Acacia Research Corporation | $ 6,321 | $ (2,129) | $ 55,611 | $ 5,702
Pro forma income (loss) per common share attributable to Acacia Research Corporation: Basic earnings (loss) per share | $ 0.13 | $ (0.05) | $ 1.20 | $ 0.15
Pro forma income (loss) per common share attributable to Acacia Research Corporation: Diluted earnings (loss) per share | $ 0.13 | $ (0.05) | $ 1.18 | $ 0.14
Weighted average number of shares outstanding, basic | 47,944,193 | 40,994,082 | 46,155,846 | 38,104,500
Weighted average number of shares outstanding, diluted | 48,938,766 | 42,453,782 | 47,208,105 | 39,477,616

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