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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock Outstanding | Common Stock | Value of Shares Held in Rabbi Trust at Cost | Deferred Compensation and Other Retirement Benefit Obligations | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance September 30, 2016 at Dec. 31, 2014 |  | 23,998,738 |  |  |  |  |  |
Balance September 30, 2015 at Dec. 31, 2014 | $ 640,527 |  | $ 237 | $ (3,666) | $ 3,666 | $ 311,978 | $ 330,444 | $ (2,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 45,505 |  |  |  |  |  | 45,505 |
Other comprehensive income | 1,449 |  |  |  |  |  |  | 1,449
Common dividend declared ($0.87 and $0.78 per share for 2016 and 2015, respectively) | (20,412) |  |  |  |  |  | (20,412) |
Common stock issued for acquisition |  | 2,052,137 |  |  |  |  |  |
Common stock issued for acquisition | 86,415 |  | 21 |  |  | 86,394 |  |
Proceeds from exercise of stock options, net of cash paid |  | 78,240 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 1,365 |  | 1 |  |  | 1,364 |  |
Tax benefit related to equity award activity | 776 |  |  |  |  | 776 |  |
Stock based compensation | 2,028 |  |  |  |  | 2,028 |  |
Restricted stock awards issued, net of awards surrendered |  | 36,901 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (645) |  | 1 |  |  | (646) |  |
Shares issued under direct stock purchase plan |  | 46,222 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 2,023 |  |  |  |  | 2,023 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (217) | 217 |  |  |
Increase (Decrease) in Deferred Compensation | 0 |  |  |  |  |  |  |
Tax benefit related to deferred compensation distributions | 172 |  |  |  |  | 172 |  |
Balance December 31, 2015 at Sep. 30, 2015 | 759,203 |  | 260 | (3,883) | 3,883 | 404,089 | 355,537 | (683)
Balance December 31, 2014 at Sep. 30, 2015 |  | 26,212,238 |  |  |  |  |  |
Balance September 30, 2016 at Dec. 31, 2015 |  | 26,236,352 |  |  |  |  |  |
Balance September 30, 2015 at Dec. 31, 2015 | 771,463 |  | 260 | (3,958) | 3,958 | 405,486 | 368,169 | (2,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 59,469 |  |  |  |  |  | 59,469 |
Other comprehensive income | 5,952 |  |  |  |  |  |  | 5,952
Common dividend declared ($0.87 and $0.78 per share for 2016 and 2015, respectively) | (22,888) |  |  |  |  |  | (22,888) |
Common stock issued for acquisition | 0 |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 9,022 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 160 |  |  |  |  | 160 |  |
Tax benefit related to equity award activity | 354 |  |  |  |  | 354 |  |
Stock based compensation | 2,308 |  |  |  |  | 2,308 |  |
Restricted stock awards issued, net of awards surrendered |  | 32,567 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (673) |  | 1 |  |  | (674) |  |
Shares issued under direct stock purchase plan |  | 42,526 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 1,918 |  |  |  |  | 1,918 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (241) | 241 |  |  |
Tax benefit related to deferred compensation distributions | 179 |  |  |  |  | 179 |  |
Balance December 31, 2015 at Sep. 30, 2016 | $ 818,242 |  | $ 261 | $ (4,199) | $ 4,199 | $ 409,731 | $ 404,750 | $ 3,500
Balance December 31, 2014 at Sep. 30, 2016 |  | 26,320,467 |  |  |  |  |  |

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