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Retirement and Share-based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Valuation Assumptions of Stock Options Granted to Officers, Directors and Employees | The fair value for each stock option granted to officers, directors and employees during the years ended December 31, 2012 and 2011 was estimated at the date of grant using a Black-Scholes option valuation model with the following assumptions:
| Year Ended December 31,
| 2012 |  | 2011
| Directors and Retirement Eligible Employees |  | Non-Retirement Eligible Employees |  | Directors and Retirement Eligible Employees |  | Non-Retirement Eligible Employees
Average risk-free interest rate | 0.76 | % |  | 1.36 | % |  | 1.66 | % |  | 2.00 | %
Dividend yield | 1.1 | % |  | 1.3 | % |  | 0.8 | % |  | 1.0 | %
Average expected life (years) | 5 |  |  | 8 |  |  | 5 |  |  | 8 |
Volatility | 62.5 | % |  | 50.9 | % |  | 66.1 | % |  | 52.0 | %
Valuation Assumptions of Stock Options Granted to Agents | The fair value for each stock option granted to agents during the years ended December 31, 2013, 2012 and 2011 was estimated using a Black-Scholes option valuation model until the grant date, at which time the options are included as permanent equity, with the following assumptions:
| Year Ended December 31,
| 2013 |  | 2012 |  | 2011
Average risk-free interest rate | 1.21 | % |  | 0.51 | % |  | 0.58 | %
Dividend yield | 0.7 | % |  | 1.2 | % |  | 1.2 | %
Average expected life (years) | 3.75 |  |  | 3.75 |  |  | 3.75 |
Volatility | 31.2 | % |  | 41.1 | % |  | 67.2 | %
Schedule of Stock Options Outstanding | Changes in the number of stock options outstanding during the years ended December 31, 2013, 2012 and 2011 are as follows:
| Number of Shares |  | Weighted-Average Exercise Price per Share |  | Total Exercise Price
| (Dollars in thousands, except per share data)
Outstanding at January 1, 2011 | 4,120,850 |  |  | $ | 8.78 |  |  | $ | 36,187 |
Granted | 1,486,850 |  |  | 12.99 |  |  | 19,309 |
Canceled | (177,500 | ) |  | 9.66 |  |  | (1,714 | )
Exercised | (585,350 | ) |  | 8.00 |  |  | (4,685 | )
Outstanding at December 31, 2011 | 4,844,850 |  |  | 10.13 |  |  | 49,097 |
Granted | 1,558,900 |  |  | 10.40 |  |  | 16,216 |
Canceled | (28,050 | ) |  | 8.97 |  |  | (251 | )
Exercised | (643,250 | ) |  | 8.93 |  |  | (5,741 | )
Outstanding at December 31, 2012 | 5,732,450 |  |  | 10.35 |  |  | 59,321 |
Granted | 1,210,950 |  |  | 13.13 |  |  | 15,899 |
Canceled | (29,400 | ) |  | 9.96 |  |  | (293 | )
Exercised | (2,937,275 | ) |  | 10.81 |  |  | (31,756 | )
Outstanding at December 31, 2013 | 3,976,725 |  |  | 10.86 |  |  | $ | 43,171 |
Schedule of Stock Options Outstanding, By Exercise Price Range | The following table summarizes information about stock options outstanding at December 31, 2013:
|  | Stock Options Outstanding |  | Stock Options Vested
Range of Exercise Prices |  | Number of Awards |  | Remaining Life (yrs) |  | Weighted-Average Exercise Price Per Share |  | Number of Awards |  | Remaining Life (yrs) |  | Weighted-Average Exercise Price Per Share
$5.07 - $9.16 |  | 756,550 |  |  | 3.17 |  | $ | 7.48 |  |  | 756,550 |  |  | 3.17 |  | $ | 7.48 |
$9.27 - $11.35 |  | 1,681,475 |  |  | 5.04 |  | 10.33 |  |  | 1,592,475 |  |  | 4.85 |  | 10.31 |
$11.87 - $14.62 |  | 1,538,700 |  |  | 5.29 |  | 13.10 |  |  | 1,433,700 |  |  | 5.11 |  | 13.16 |
$5.07 - $14.62 |  | 3,976,725 |  |  | 4.78 |  | 10.86 |  |  | 3,782,725 |  |  | 4.61 |  | 10.83 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: 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 + 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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