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Employment Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Projected Benefit Payments from Postretirement Plan | The following table sets forth projected benefit payments from Ambac’s postretirement plan:
|  | Amount |
2013 |  | $ | 495,000 |
2014 |  |  | 492,000 |
2015 |  |  | 565,000 |
2016 |  |  | 618,000 |
2017 |  |  | 637,000 |
All later years |  |  | 3,591,000 |
|  | $ | 6,398,000 |
Option Activity | A summary of option activity for the period ending December 31, 2012 is as follows:
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Weighted Average Remaining Contractual Life |
Outstanding at beginning of year |  |  | 1,139,429 |  |  | $ | 45.15 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | na. |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | na. |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (536,654 | ) |  | $ | 49.63 |  |  |  |  |  |  |  |  |
Outstanding at end of year |  |  | 602,775 |  |  | $ | 41.17 |  |  | $ | 0 |  |  |  | 1.46 |
Exercisable |  |  | 602,775 |  |  | $ | 41.17 |  |  | $ | 0 |  |  |  | 1.46 |
Summary of Rsu and Other Stock Activity | A summary of RSU activity for 2012 is as follows:
|  | 2012 |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding at beginning of year |  |  | 113,739 |  |  | $ | 23.96 |
Granted |  |  | 0 |  |  | $ | 0 |
Delivered |  |  | (9,350 | ) |  | $ | 52.16 |
Forfeited |  |  | 0 |  |  | $ | 0 |
Outstanding at end of year |  |  | 104,389 |  |  | $ | 21.43 |

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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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