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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 Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 |  | $ 864,690 |  | $ 268 | $ (4,277) | $ 4,277 | $ 451,664 | $ 414,095 | $ (1,337)
Beginning balance (in shares) at Dec. 31, 2016 |  |  | 27,005,813 |  |  |  |  |  |
Net income |  | 87,204 |  |  |  |  |  | $ 87,204 |
Other comprehensive loss |  | (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 |  |  |  |  | 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 |  |  |  |  | (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 | [2] | 0 |  |  |  |  |  | 397 | (397)
Net income |  | 121,622 |  |  |  |  |  | $ 121,622 |
Other comprehensive loss |  | 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 |  | 0 |  |  | 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 |  | 0 |  |  |  |  |  |  |
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 | [3] | 0 |  |  |  |  |  |  |
Net income |  | 29,934 |  |  |  |  |  |  |
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 | [3] |  |  |  |  |  |  | 831 | (831)
Net income |  | 165,175 |  |  |  |  |  | $ 165,175 |
Other comprehensive loss |  | 19,342 |  |  |  |  |  |  | 19,342
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  | $ 1.76 |
Common dividend declared |  | (57,729) |  |  |  |  |  | $ (57,729) |
Common stock issued for acquisition |  | 499,693 |  | 61 |  |  | 499,632 |  |
Common stock issued for acquisition (in shares) |  |  | 6,166,010 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 281 |  |  |  |  | 281 |  |
Proceeds from exercise of stock options (in shares) |  |  | 14,646 |  |  |  |  |  |
Stock based compensation |  | 4,403 |  |  |  |  | 4,403 |  |
Restricted stock awards issued, net of awards surrendered (in shares) |  |  | 50,080 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (1,463) |  | 1 |  |  | (1,464) |  |
Stock Issued During Period, Shares, Other |  |  | 66,244 |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | 4,951 |  | 1 |  |  | 4,950 |  |
Increase (Decrease) in Deferred Compensation |  | 0 |  |  |  |  |  |  |
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits |  |  |  |  | (17) | 17 |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  | 34,377,388 |  |  |  |  |  |
Ending balance at Dec. 31, 2019 |  | $ 1,708,143 |  | $ 342 | $ (4,735) | $ 4,735 | $ 1,035,450 | $ 654,182 | $ 18,169
[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 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.
[3] | 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.

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant