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Net Income Per Share | 9 Months Ended
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Sep. 30, 2011
Net Income Per Share [Abstract] |
Net Income Per Share | (3) Net income per Share ASC Paragraph 260-10-65-2 of ASC Topic 260, Earnings Per Share, effective for fiscal years beginning after December 15, 2008, clarified that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of EPS pursuant to the two-class method. Ambac had participating securities consisting of nonvested common stock with the same voting and dividend rights as our common stock. These shares of common stock all vested in January 2010. At such time Ambac was in a net loss position; consequently, no income or loss was allocated to participating securities during the three and nine months ended September 30, 2011 and 2010. Basic net income per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Common shares outstanding includes common stock issued less treasury shares plus restricted stock units for which no future service is required as a condition to the delivery of the underlying common stock. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding plus all dilutive potential common shares outstanding during the period. All dilutive potential common shares outstanding consider common stock deliverable pursuant to stock options, nonvested restricted stock units, nonvested common shares, and stock purchase contracts. There were no dilutive effects for the three and nine months ended September 30, 2011 and 2010. The following table presents securities outstanding that could potentially dilute basic EPS in the future that were not included in the computation of diluted EPS because they were antidilutive for the three and nine month periods ended September 30, 2011 and 2010:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Stock options |  |  | 1,718,735 |  |  |  | 2,704,875 |  |  |  | 1,742,167 |  |  |  | 2,840,390 |
Restricted stock and units |  |  | 461,589 |  |  |  | 994,065 |  |  |  | 465,465 |  |  |  | 1,120,815 |
Stock purchase contracts |  |  | — |  |  |  | 37,037,000 |  |  |  | — |  |  |  | 37,037,000 |
In March 2008, Ambac issued 5,000,000 Corporate Units. Each Corporate Unit had a stated amount of $50 and initially consisted of (a) a Purchase Contract for Ambac common stock issued by Ambac and (b) a 5% beneficial ownership interest in $1,000 principal amount of Ambac's 9.50% Senior Notes due 2021, to be held by the Collateral Agent to secure the performance of the holder's obligations under the Purchase Contract. Pursuant to the Purchase Contract Agreement, the filing of bankruptcy constituted a termination event. As a result, the Purchase Contracts were terminated and the Corporate Units thereafter represented the rights of the Holders to receive their applicable ownership interests in the $250,000 Senior Notes. On November 16, 2010, Ambac filed a motion seeking an order approving the termination of the Purchase Contracts and the release of the Senior Notes. On November 30, 2010, the Bankruptcy Court approved the motion. Consequently, at September 30, 2011, no Purchase Contracts are outstanding.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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