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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation Expense and Related Tax Benefits | The table below provides the share-based compensation expense and related tax benefits for the periods indicated:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (In thousands)
Share-based compensation expense | $ | 3,008 |  |  | $ | 2,241 |  |  | $ | 2,165 |
Related tax benefits | $ | 1,191 |  |  | $ | 755 |  |  | $ | 516 |
Unrecognized Share-Based Compensation Expense | As of December 31, 2016, unrecognized share-based compensation expense was as follows
| Unrecognized Expense |  | Average Expected Recognition Period
| (In thousands)
Stock option awards | $ | 99 |  |  | 0.8 years
Restricted stock awards | 3,836 |  |  | 2.3 years
Total unrecognized share-based compensation expense | $ | 3,935 |  |  | 2.2 years
Weighted-Average Assumptions Used to Estimate Fair Value Per Share of Options Granted | The weighted-average fair value per share of options granted was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
| Year Ended December 31,
|  | 2015 |  | 2014
Weighted-average assumption |  |  |  |
Dividend yield |  | 1.80 | % |  | 1.27 | %
Expected volatility |  | 25.00 | % |  | 35.18 | %
Expected term |  | 3 years |  |  | 3 years |
Risk-free interest rate |  | 1.11 | % |  | 0.86 | %
Summary of Information under Plans | The following information under the Plans is presented for the periods indicated:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (In thousands, except per share data)
Grant date fair value of options granted | $ | — |  |  | $ | 78 |  |  | $ | 583 |
Fair value of options vested | $ | 2,322 |  |  | $ | 2,668 |  |  | $ | 2,141 |
Total intrinsic value of options exercised (1) | $ | 1,862 |  |  | $ | 488 |  |  | $ | 353 |
Cash received from options exercised | $ | 1,453 |  |  | $ | 616 |  |  | $ | 467 |
Weighted-average estimated fair value per share of options granted | $ | — |  |  | $ | 3.62 |  |  | $ | 4.79 |
(1) | Intrinsic value represents the difference between the closing stock price on the exercise date and the exercise price, multiplied by the number of options.
Summary of Stock Option Transactions under Plans | The following is a summary of stock option transactions under the Plans for the periods indicated:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Number of Shares |  | Weighted- Average Exercise Price Per Share
Options outstanding at beginning of period | 510,148 |  |  | $ | 24.38 |  |  | 603,872 |  |  | $ | 23.78 |  |  | 546,595 |  |  | $ | 28.09 |
Options granted | — |  |  | $ | — |  |  | 28,000 |  |  | $ | 23.47 |  |  | 158,000 |  |  | $ | 21.30 |
Options exercised | (94,997 | ) |  | $ | 15.29 |  |  | (46,516 | ) |  | $ | 13.24 |  |  | (37,569 | ) |  | $ | 12.42 |
Options forfeited | (125 | ) |  | $ | 144.00 |  |  | (71,608 | ) |  | $ | 20.59 |  |  | (30,917 | ) |  | $ | 14.64 |
Options expired | (27,125 | ) |  | $ | 154.09 |  |  | (3,600 | ) |  | $ | 136.79 |  |  | (32,237 | ) |  | $ | 106.70 |
Options outstanding at end of period | 387,901 |  |  | $ | 17.49 |  |  | 510,148 |  |  | $ | 24.38 |  |  | 603,872 |  |  | $ | 23.78 |
Options exercisable at end of period | 341,561 |  |  | $ | 16.85 |  |  | 333,460 |  |  | $ | 27.16 |  |  | 224,766 |  |  | $ | 33.35 |
Summary of Transactions for Non-Vested Stock Options | The following is a summary of transactions for non-vested stock options under the Plans for the periods indicated:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Number of Shares |  | Weighted- Average Exercise Price Per Share
Non-vested options outstanding at beginning of period | 176,688 |  |  | $ | 19.13 |  |  | 379,106 |  |  | $ | 18.11 |  |  | 391,625 |  |  | $ | 15.56 |
Options granted | — |  |  | $ | — |  |  | 28,000 |  |  | $ | 23.47 |  |  | 158,000 |  |  | $ | 21.30 |
Options vested | (130,223 | ) |  | $ | 17.83 |  |  | (158,810 | ) |  | $ | 16.80 |  |  | (139,602 | ) |  | $ | 15.34 |
Options forfeited | (125 | ) |  | $ | 144.00 |  |  | (71,608 | ) |  | $ | 20.59 |  |  | (30,917 | ) |  | $ | 14.64 |
Non-vested options outstanding at end of period | 46,340 |  |  | $ | 22.42 |  |  | 176,688 |  |  | $ | 19.13 |  |  | 379,106 |  |  | $ | 18.11 |
Summary of Stock Options Outstanding under Plans | As of December 31, 2016, stock options outstanding under the Plans were as follows:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number of Shares |  | Intrinsic Value (1) |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Life |  | Number of Shares |  | Intrinsic Value (1) |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Life
|  |  |  |  |  | (In thousands except share and per share data) |  |
$10.88 to $14.99 |  | 36,901 |  |  | $ | 835 |  |  | $ | 12.27 |  |  | 5.4 years |  | 36,901 |  |  | $ | 835 |  |  | $ | 12.27 |  |  | 5.4 years
$15.00 to $19.99 |  | 265,000 |  |  | 4,861 |  |  | 16.55 |  |  | 6.7 years |  | 255,000 |  |  | 4,710 |  |  | 16.43 |  |  | 6.7 years
$20.00 to $24.83 |  | 86,000 |  |  | 1,056 |  |  | 22.62 |  |  | 7.7 years |  | 49,660 |  |  | 509 |  |  | 22.39 |  |  | 7.5 years
|  | 387,901 |  |  | $ | 6,752 |  |  | $ | 17.49 |  |  | 6.8 years |  | 341,561 |  |  | $ | 6,054 |  |  | $ | 16.85 |  |  | 6.6 years
(1) | Intrinsic value represents the difference between the closing stock price on the last trading day of the period, which was $34.90 as of December 31, 2016, and the exercise price, multiplied by the number of options.
Schedule of Restricted Stock Awards under 2013 Plan | The table below provides information for restricted stock awards under the 2013 Plan for the periods indicated:
| 2016 |  | 2015 |  | 2014
| Number of Shares |  | Weighted- Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted- Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted- Average Grant Date Fair Value Per Share
Restricted stock at beginning of period | 137,114 |  |  | $ | 20.74 |  |  | 173,222 |  |  | $ | 19.58 |  |  | 116,082 |  |  | $ | 16.43 |
Restricted stock granted | 287,179 |  |  | $ | 15.52 |  |  | 58,092 |  |  | $ | 22.53 |  |  | 119,988 |  |  | 21.56 |
Restricted stock vested | (77,515 | ) |  | $ | 19.75 |  |  | (68,017 | ) |  | $ | 19.16 |  |  | (53,515 | ) |  | $ | 17.61 |
Restricted stock forfeited | (2,820 | ) |  | $ | 21.58 |  |  | (26,183 | ) |  | $ | 21.16 |  |  | (9,333 | ) |  | $ | 17.05 |
Restricted stock at end of period | 343,958 |  |  | $ | 16.60 |  |  | 137,114 |  |  | $ | 20.74 |  |  | 173,222 |  |  | $ | 19.58 |

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