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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 June 30, 2016 at Dec. 31, 2014 |  | 23,998,738 |  |  |  |  |  |
Balance June 30, 2015 at Dec. 31, 2014 | $ 640,527 |  | $ 237 | $ (3,666) | $ 3,666 | $ 311,978 | $ 330,444 | $ (2,132)
Net income | 26,910 |  |  |  |  |  | 26,910 |
Other comprehensive income | (4) |  |  |  |  |  |  | (4)
Common dividend declared ($0.58 per share) | (13,597) |  |  |  |  |  | (13,597) |
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 |  | 40,314 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 311 |  | 0 |  |  | 311 |  |
Tax benefit related to equity award activity | 546 |  |  |  |  | 546 |  |
Stock based compensation | 1,362 |  |  |  |  | 1,362 |  |
Restricted stock awards issued, net of awards surrendered |  | 36,101 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (645) |  | 1 |  |  | (646) |  |
Shares issued under direct stock purchase plan |  | 31,536 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 1,327 |  |  |  |  | 1,327 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (119) | 119 |  |  |
Increase (Decrease) in Deferred Compensation | 0 |  |  |  |  |  |  |
Tax benefit related to deferred compensation distributions | 165 |  |  |  |  | 165 |  |
Balance December 31, 2015 at Jun. 30, 2015 | 743,317 |  | 259 | (3,785) | 3,785 | 401,437 | 343,757 | (2,136)
Balance December 31, 2014 at Jun. 30, 2015 |  | 26,158,826 |  |  |  |  |  |
Balance June 30, 2016 at Dec. 31, 2015 |  | 26,236,352 |  |  |  |  |  |
Balance June 30, 2015 at Dec. 31, 2015 | 771,463 |  | 260 | (3,958) | 3,958 | 405,486 | 368,169 | (2,452)
Net income | 38,985 |  |  |  |  |  | 38,985 |
Other comprehensive income | 6,035 |  |  |  |  |  |  | 6,035
Common dividend declared ($0.58 per share) | (15,256) |  |  |  |  |  | (15,256) |
Common stock issued for acquisition | 0 |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 6,652 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 144 |  |  |  |  | 144 |  |
Tax benefit related to equity award activity | 327 |  |  |  |  | 327 |  |
Stock based compensation | 1,633 |  |  |  |  | 1,633 |  |
Restricted stock awards issued, net of awards surrendered |  | 42,967 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (673) |  | 1 |  |  | (674) |  |
Shares issued under direct stock purchase plan |  | 23,916 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 1,060 |  |  |  |  | 1,060 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (155) | 155 |  |  |
Tax benefit related to deferred compensation distributions | 179 |  |  |  |  | 179 |  |
Balance December 31, 2015 at Jun. 30, 2016 | $ 803,897 |  | $ 261 | $ (4,113) | $ 4,113 | $ 408,155 | $ 391,898 | $ 3,583
Balance December 31, 2014 at Jun. 30, 2016 |  | 26,309,887 |  |  |  |  |  |

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