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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | COMMON STOCK [Member] | CAPITAL SURPLUS [Member] | RETAINED EARNINGS [Member] | RETAINED EARNINGS [Member] CUMULATIVE EFFECT, PERIOD OF ADOPTION, ADJUSTMENT [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2019 |  | $ 32,694 | $ 153,353 | $ 815,488 | $ 2,270 | $ 3,454
Shares issued for stock options |  | 28 | 507 |  |  |
Shares acquired and canceled |  | (59) |  | (3,039) |  |
Net income | $ 43,338 |  |  | $ 43,338 |  |
Accounting Standards Update Extensible List |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |
Dividends on common stock |  |  |  | $ (20,903) |  |
Stock-based compensation arrangements |  |  | 832 |  |  |
Net change |  |  |  |  |  | 6,236
Balance at end of period at Jun. 30, 2020 | 1,034,199 | 32,663 | 154,692 | 837,154 |  | 9,690
Balance at beginning of period at Mar. 31, 2020 |  | 32,647 | 153,999 | 826,855 |  | 9,879
Shares issued for stock options |  | 16 | 287 |  |  |
Net income | 20,730 |  |  | 20,730 |  |
Dividends on common stock |  |  |  | (10,431) |  |
Stock-based compensation arrangements |  |  | 406 |  |  |
Net change |  |  |  |  |  | (189)
Balance at end of period at Jun. 30, 2020 | 1,034,199 | 32,663 | 154,692 | 837,154 |  | 9,690
Balance at beginning of period at Dec. 31, 2020 | 1,067,885 | 32,720 | 156,574 | 871,161 |  | 7,430
Shares issued for stock options |  | 65 | 1,657 |  |  |
Net income | 90,712 |  |  | 90,712 |  |
Dividends on common stock |  |  |  | (22,285) |  |
Net cash settlement of options |  |  | (958) | (4,521) |  |
Stock-based compensation arrangements |  |  | 1,049 |  |  |
Net change |  |  |  |  |  | (2,013)
Balance at end of period at Jun. 30, 2021 | 1,131,591 | 32,785 | 158,322 | 935,067 |  | 5,417
Balance at beginning of period at Mar. 31, 2021 |  | 32,771 | 157,450 | 898,026 |  | 6,424
Shares issued for stock options |  | 14 | 399 |  |  |
Net income | 48,192 |  |  | 48,192 |  |
Dividends on common stock |  |  |  | (11,151) |  |
Stock-based compensation arrangements |  |  | 473 |  |  |
Net change |  |  |  |  |  | (1,007)
Balance at end of period at Jun. 30, 2021 | $ 1,131,591 | $ 32,785 | $ 158,322 | $ 935,067 |  | $ 5,417

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