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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2013
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] |
Share-Based Compensation | Share-Based Compensation Share-based compensation expense for all share-based payment awards granted or modified is based on the estimated grant-date fair value. The Company recognizes these compensation costs on a straight-line basis over the requisite service period of the award, which is the option vesting term of four or five years for options granted prior to 2008 and four years for options granted subsequent to January 1, 2008, for only those shares expected to vest. The fair value of stock option awards is estimated using the Black-Scholes option pricing model with the grant-date assumptions and weighted-average fair values. Under the Company's 2005 Incentive Award Plan (the “Plan”), the Compensation Committee of the Company’s Board of Directors granted performance vesting restricted stock units to the Company’s senior management and key employees as follows:
| Grant Year
| 2013 |  | 2012 |  | 2011
Three-year performance period ending December 31, | 2015 |  |  | 2014 |  |  | 2013 |
Vesting shares, target | 84,500 |  |  | 89,000 |  |  | 80,000 |
Vesting shares, maximum | 190,125 |  |  | 200,250 |  |  | 120,000 |
The restricted stock units vest at the end of a three-year performance period beginning with the year of the grant, and then only if, and to the extent that, the Company’s performance during the performance period achieves the threshold established by the Compensation Committee of the Company's Board of Directors. For 2011 grants, vesting will be based on the Company's cumulative underwriting income. For 2012 grants, vesting will be based on the Company's cumulative underwriting income and net premium written growth. For 2013 grants, vesting will be based on the Company's cumulative underwriting income, annual underwriting income, and net premiums written growth. The fair value of each restricted share grant was determined based on the market price on the grant date. Compensation cost is recognized based on management’s best estimate that performance goals will be achieved. If such goals are not met, no compensation cost is recognized and any recognized compensation cost would be reversed. For the 2012 and 2011 grants, the achievement of the performance condition set by the Compensation Committee was no longer considered probable, and previously recognized compensation costs were reversed.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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