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Share-Based Compensation | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation In February 2015, the Company adopted the 2015 Incentive Award Plan (the "2015 Plan"), replacing the 2005 Equity Incentive Plan (the "2005 Plan") which expired in January 2015. The 2015 Plan was approved at the Company's Annual Meeting of Shareholders in May 2015. A maximum of 4,900,000 shares of common stock under the 2015 Plan are authorized for issuance upon exercise of stock options, stock appreciation rights and other awards, or upon vesting of restricted or deferred stock awards. As of December 31, 2015, only stock options and restricted stock unit awards have been granted under these plans. Beginning January 1, 2008, stock options granted, for which the Company has recognized share-based compensation expense, become exercisable at a rate of 25% per year beginning one year from the date granted, are granted at the closing price of the Company's stock on the date of grant, and expire after 10 years. Prior to January 1, 2008, stock options granted became exercisable at a rate of 20% per year.
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (Amounts in thousands)
Cash received from stock option exercises |  | $ | 2,111 |  |  | $ | 6,247 |  |  | $ | 1,446 |
Compensation cost |  | 5,208 |  |  | 4,112 |  |  | 974 |
Excess tax benefit |  | 27 |  |  | 148 |  |  | 202 |
Stock Option Awards No stock options were awarded in 2015 and 2014 under the 2015 Plan and 2005 Plan, respectively. The fair values of stock options awarded in 2013 under the 2005 Plan were estimated on the dates of grant using a closed-form option valuation model (Black-Scholes). The following table provides the assumptions used in the calculation of grant-date fair values of stock options awarded during 2013 based on the Black-Scholes option pricing model.
| 2013
Weighted-average grant-date fair value | $7.11
Expected volatility | 33.16% - 33.18%
Weighted-average expected volatility | 33.17%
Risk-free interest rate | 0.88% - 1.60%
Expected dividend yield | 5.40% - 5.76%
Expected term in months | 72
Expected volatilities are based on historical volatility of the Company’s stock over the term of the stock options. The Company estimated the expected term of stock options, which represents the period of time that stock options granted are expected to be outstanding, by using historical exercise patterns and post-vesting termination behavior. The risk free interest rate is determined based on U.S. Treasury yields with equivalent remaining terms in effect at the time of the grant. The following table presents a summary of the stock option activity under the Company’s plans for the year ended December 31, 2015:
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in 000’s)
Outstanding at January 1, 2015 | 248,000 |  |  | $ | 49.85 |  |  |  |  |
Granted | — |  |  |  |  |  |  |  |
Exercised | (43,000) |  |  | $ | 49.10 |  |  |  |  |
Canceled or expired | (37,000) |  |  | $ | 58.48 |  |  |  |  |
Outstanding at December 31, 2015 | 168,000 |  |  | $ | 48.14 |  |  | 3.8 |  | $ | 305 |
Exercisable at December 31, 2015 | 128,000 |  |  | $ | 49.58 |  |  | 2.7 |  | $ | 183 |
The aggregate intrinsic values in the table above represent the total pre-tax intrinsic value (the difference between the Company’s closing stock price and the stock option exercise price, multiplied by the number of in-the-money stock options) that would have been received by the stock option holders had all stock options been exercised on December 31, 2015. The aggregate intrinsic values of stock options exercised were $303,000, $1,160,000, and $862,000 during 2015, 2014, and 2013, respectively. The total fair values of stock options vested were $142,000, $142,000, and $146,000 during 2015, 2014, and 2013, respectively. The following table presents information regarding stock options outstanding at December 31, 2015:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number of Options |  | Weighted-Average Remaining Contractual Life (Years) |  | Weighted- Average Exercise Price |  | Number of Options |  | Weighted- Average Exercise Price
$33.61-$47.61 | 88,000 |  | 6.1 |  | $ | 43.29 |  |  | 48,000 |  | $ | 43.09 |
$50.01-$51.51 | 38,000 |  | 2.0 |  | $ | 50.72 |  |  | 38,000 |  | $ | 50.72 |
$54.93-$57.50 | 42,000 |  | 0.8 |  | $ | 55.96 |  |  | 42,000 |  | $ | 55.96 |
As of December 31, 2015, $202,000 of total unrecognized compensation cost related to non-vested stock options is expected to be recognized over a weighted-average remaining contractual life of 1.4 years. Restricted Stock Unit Awards Under the 2015 Plan and 2005 Plan, the Compensation Committee of the Company’s Board of Directors granted performance-based vesting restricted stock unit awards to the Company’s senior management and key employees. The following table presents the restricted stock unit grants summary at December 31, 2015:
| Grant Year
| 2015 |  | 2014 |  | 2013
Three-year performance period ending December 31, | 2017 |  |  | 2016 |  |  | 2015 |
Vesting shares, target (net of forfeited) | 99,250 |  |  | 85,500 |  |  | 78,500 |
Vesting shares, maximum (net of forfeited) | 186,094 |  |  | 160,313 |  |  | 176,625 |
The following table presents a summary of restricted stock unit awards activity during the years indicated:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
| Shares |  | Weighted- Average Fair Value per Share |  | Shares |  | Weighted- Average Fair Value per Share |  | Shares |  | Weighted- Average Fair Value per Share
Outstanding at January 1 | 167,000 |  |  | $ | 41.15 |  |  | 170,500 |  |  | $ | 39.64 |  |  | 169,000 |  |  | $ | 42.22 |
Granted | 100,250 |  |  | $ | 53.80 |  |  | 93,500 |  |  | $ | 45.17 |  |  | 84,500 |  |  | $ | 36.82 |
Vested | — |  |  |  |  | — |  |  |  |  | — |  |  |
Forfeited/Canceled | (4,000) |  |  | $ | 43.10 |  |  | (16,500) |  |  | $ | 43.99 |  |  | (3,000) |  |  | $ | 36.82 |
Expired | — |  |  | $ | — |  |  | (80,500) |  |  | $ | 44.01 |  |  | (80,000) |  |  | $ | 40.22 |
Outstanding at December 31 | 263,250 |  |  | $ | 45.94 |  |  | 167,000 |  |  | $ | 41.15 |  |  | 170,500 |  |  | $ | 39.64 |
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 2013, 2014 and 2015 grants, vesting is based on the Company’s cumulative underwriting income, annual underwriting income, and net earned premium growth. As of December 31, 2015, 1,000, 8,000, and 6,000 target restricted stock units granted in 2015, 2014 and 2013, respectively, have been forfeited because the recipients were no longer employed by the Company. Expired shares represent shares that did not meet the vesting requirements. The fair value of each restricted stock unit grant was determined based on the closing price of the Company's common stock 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 would be recognized and any previously recognized compensation cost would be 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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: 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=51659978&loc=d3e25284-112666 Reference 3: 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 4: 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 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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