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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock Outstanding | Common Stock | Value of Shares Held in Rabbi Trust at Cost | Deferred Compensation Obligation | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 |  | $ 771,463 |  |  | $ 260 | $ (3,958) | $ 3,958 | $ 405,486 | $ 368,169 |  | $ (2,452) |
Beginning balance (in shares) at Dec. 31, 2015 |  |  |  | 26,236,352 |  |  |  |  |  |  |  |
Net income |  | 76,648 |  |  |  |  |  |  | $ 76,648 |  |  |
Other comprehensive income |  | 1,115 |  |  |  |  |  |  |  |  | 1,115 |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  | $ 1.16 |  |  |
Common dividend declared |  | (30,722) |  |  |  |  |  |  | $ (30,722) |  |  |
Common stock issued for acquisition |  | 40,730 |  |  | 7 |  |  | 40,723 |  |  |  |
Common stock issued for acquisition (in shares) |  |  |  | 672,665 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 201 |  |  |  |  |  | 201 |  |  |  |
Proceeds from exercise of stock options (in shares) |  |  |  | 13,449 |  |  |  |  |  |  |  |
Tax benefit related to equity award activity |  | 476 |  |  |  |  |  | 476 |  |  |  |
Stock based compensation |  | 2,965 |  |  |  |  |  | 2,965 |  |  |  |
Restricted stock awards issued, net of awards surrendered (in shares) |  |  |  | 33,432 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (696) |  |  | 1 |  |  | (697) |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  | 49,915 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | 2,323 |  |  |  |  |  | 2,323 |  |  |  |
Increase (Decrease) in Deferred Compensation |  |  |  |  |  | (319) | 319 |  |  |  |  |
Tax benefit related to deferred compensation distributions |  | 187 |  |  |  |  |  | 187 |  |  |  |
Ending balance (in shares) at Dec. 31, 2016 |  |  |  | 27,005,813 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 |  | 864,690 |  |  | 268 | (4,277) | 4,277 | 451,664 | 414,095 |  | (1,337) |
Net income |  | 87,204 |  |  |  |  |  |  | $ 87,204 |  |  |
Other comprehensive income |  | (494) |  |  |  |  |  |  |  |  | (494) |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  | $ 1.28 |  |  |
Common dividend declared |  | (34,997) |  |  |  |  |  |  | $ (34,997) |  |  |
Common stock issued for acquisition |  | 23,468 |  |  | 4 |  |  | 23,464 |  |  |  |
Common stock issued for acquisition (in shares) |  |  |  | 369,286 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 214 |  |  | 0 |  |  | 214 |  |  |  |
Proceeds from exercise of stock options (in shares) |  |  |  | 19,340 |  |  |  |  |  |  |  |
Stock based compensation |  | 3,333 |  |  |  |  |  | 3,333 |  |  |  |
Restricted stock awards issued, net of awards surrendered (in shares) |  |  |  | 31,665 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (1,422) |  |  | 1 |  |  | (1,423) |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  | 24,086 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | 1,636 |  |  |  |  |  | 1,636 |  |  |  |
Increase (Decrease) in Deferred Compensation |  | 0 |  |  |  | (313) | 313 |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  |  |  | 27,450,190 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2017 |  | 943,809 |  |  | 273 | (4,590) | 4,590 | 479,430 | 465,937 |  | (1,831) |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | [1] | 177 |  |  |  |  |  | 542 | (365) |  |  |
Prior Period Reclassification Adjustment |  | 0 | [2] |  |  |  |  |  | 397 | [3] | (397) | [3]
Net income |  | 121,622 |  |  |  |  |  |  | $ 121,622 |  |  |
Other comprehensive income |  | 1,886 |  |  |  |  |  |  |  |  | 1,886 |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  | $ 1.52 |  |  |
Common dividend declared |  | (42,051) |  |  |  |  |  |  | $ (42,051) |  |  |
Common stock issued for acquisition |  | 42,474 |  |  | 5 |  |  | 42,469 |  |  |  |
Common stock issued for acquisition (in shares) |  |  |  | 528,353 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 184 |  |  |  |  |  | 184 |  |  |  |
Proceeds from exercise of stock options (in shares) |  |  |  | 23,195 |  |  |  |  |  |  |  |
Stock based compensation |  | 4,225 |  |  |  |  |  | 4,225 |  |  |  |
Restricted stock awards issued, net of awards surrendered (in shares) |  |  |  | 43,383 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (1,371) |  |  | 1 |  |  | (1,372) |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  | 35,287 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | 2,712 |  |  |  |  |  | 2,712 |  |  |  |
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits |  |  |  |  |  | (128) | 128 |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  |  |  | 28,080,408 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | 1,073,490 |  |  | $ 279 | $ (4,718) | $ 4,718 | $ 527,648 | 546,736 |  | (1,173) |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 0 | [3] |  |  |  |  |  | $ 831 | [2] | $ (831) | [2]
[1] | Represents adjustment needed to reflect the cumulative impact on retained earnings for previously recognized stock based compensation, which included an adjustment for estimated forfeitures. Pursuant to the Company's adoption of Accounting Standards Update 2016-09, the Company has elected to recognize stock based compensation without inclusion of a forfeiture estimate, and as such has recognized this adjustment to present retained earnings consistent with this election.
[2] | Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.
[3] | Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act (the "Tax Act"). Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.

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