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v3.20.4

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | CUMULATIVE EFFECT, PERIOD OF ADOPTION, ADJUSTMENT [Member] | Common Stock [Member] | CAPITAL SURPLUS [Member] | RETAINED EARNINGS [Member] | RETAINED EARNINGS [Member] CUMULATIVE EFFECT, PERIOD OF ADOPTION, ADJUSTMENT [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME [Member] CUMULATIVE EFFECT, PERIOD OF ADOPTION, ADJUSTMENT [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period, Shares at Dec. 31, 2017 |  |  | 31,894,563 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 |  |  | $ 31,895 | $ 107,481 | $ 638,580 | $ (618) | $ (2,327) | $ 618
Accounting Standards Update Extensible List |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |  | us-gaap:AccountingStandardsUpdate201613Member |
Shares issued for stock options, Shares |  |  | 127,816 |  |  |  |  |
Shares issued for stock options, Value |  |  | $ 127 | 2,111 |  |  |  |
Shares issued for acquisitions, Shares |  |  | 732,811 |  |  |  |  |
Shares issued for acquisitions, Value |  |  | $ 733 | 38,765 |  |  |  |
Net income | $ 125,814 |  |  |  | $ 125,814 |  |  |
Net change | $ (430) |  |  |  |  |  | $ (430) |
Dividends on common stock |  |  |  |  | (33,398) |  |  |
Stock-based compensation arrangements |  |  |  | 1,352 |  |  |  |
Shares acquired and canceled, Shares |  |  | (151,264) |  |  |  |  |
Shares acquired and canceled, Value |  |  | $ (151) |  | (7,763) |  |  |
Balance at end of period, Shares at Dec. 31, 2018 | 32,603,926 |  | 32,603,926 |  |  |  |  |
Balance at end of period at Dec. 31, 2018 | $ 902,789 |  | $ 32,604 | 149,709 | 722,615 |  | (2,139) |
Shares issued for stock options, Shares |  |  | 117,012 |  |  |  |  |
Shares issued for stock options, Value |  |  | $ 117 | 2,367 |  |  |  |
Net income | 134,879 |  |  |  | 134,879 |  |  |
Net change | $ 5,593 |  |  |  |  |  | 5,593 |
Dividends on common stock |  |  |  |  | (40,432) |  |  |
Stock-based compensation arrangements |  |  |  | 1,277 |  |  |  |
Shares acquired and canceled, Shares |  |  | (26,670) |  |  |  |  |
Shares acquired and canceled, Value |  |  | $ (27) |  | (1,574) |  |  |
Balance at end of period, Shares at Dec. 31, 2019 | 32,694,268 |  | 32,694,268 |  |  |  |  |
Balance at end of period at Dec. 31, 2019 | $ 1,004,989 |  | $ 32,694 | 153,353 | $ 815,488 | $ 2,270 | 3,454 |
Accounting Standards Update Extensible List |  | us-gaap:AccountingStandardsUpdate201613Member |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |
Shares issued for stock options, Shares |  |  | 84,868 |  |  |  |  |
Shares issued for stock options, Value |  |  | $ 85 | 1,705 |  |  |  |
Net income | 99,586 |  |  |  | $ 99,586 |  |  |
Net change | $ 3,976 |  |  |  |  |  | 3,976 |
Dividends on common stock |  |  |  |  | (43,144) |  |  |
Stock-based compensation arrangements |  |  |  | 1,516 |  |  |  |
Shares acquired and canceled, Shares |  |  | (59,284) |  |  |  |  |
Shares acquired and canceled, Value |  |  | $ (59) |  | (3,039) |  |  |
Balance at end of period, Shares at Dec. 31, 2020 | 32,719,852 |  | 32,719,852 |  |  |  |  |
Balance at end of period at Dec. 31, 2020 | $ 1,067,885 |  | $ 32,720 | $ 156,574 | $ 871,161 |  | $ 7,430 |

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