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Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Cumulative-effect of accounting changes | Common Stock | Paid-in Capital | Retained Earnings Substantially Restricted | Retained Earnings Substantially Restricted Cumulative-effect of accounting changes | Accumulated Other Compre- hensive Income (loss)
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning (in shares) at Dec. 31, 2019 |  |  | 92,289,750 |  |  |  |
Balance, beginning at Dec. 31, 2019 | $ 1,960,733 | $ (12,347) | $ 923 | $ 1,378,534 | $ 541,050 | $ (12,347) | $ 40,226
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | 184,540 |  |  |  | 184,540 |  |
Other comprehensive income (loss) | 90,872 |  |  |  |  |  | 90,872
Cash dividends declared | (84,134) |  |  |  | (84,134) |  |
Stock issued in connection with acquisitions (in shares) |  |  | 3,007,044 |  |  |  |
Stock issued in connection with acquisitions | 112,133 |  | $ 30 | 112,103 |  |  |
Stock issuances under stock incentive plans (in shares) |  |  | 116,949 |  |  |  |
Stock issuances under stock incentive plans |  |  | $ 1 | (1) |  |  |
Stock-based compensation and related taxes | 3,292 |  |  | 3,292 |  |  |
Balance, ending (in shares) at Sep. 30, 2020 |  |  | 95,413,743 |  |  |  |
Balance, ending at Sep. 30, 2020 | $ 2,255,089 |  | $ 954 | 1,493,928 | 629,109 |  | 131,098
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends declared per share (in dollars per share) | $ 0.88 |  |  |  |  |  |
Balance, beginning (in shares) at Jun. 30, 2020 |  |  | 95,409,061 |  |  |  |
Balance, beginning at Jun. 30, 2020 | $ 2,203,715 |  | $ 954 | 1,492,817 | 580,035 |  | 129,909
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | 77,757 |  |  |  | 77,757 |  |
Other comprehensive income (loss) | 1,189 |  |  |  |  |  | 1,189
Cash dividends declared | (28,683) |  |  |  | (28,683) |  |
Stock issuances under stock incentive plans (in shares) |  |  | 4,682 |  |  |  |
Stock-based compensation and related taxes | 1,111 |  |  | 1,111 |  |  |
Balance, ending (in shares) at Sep. 30, 2020 |  |  | 95,413,743 |  |  |  |
Balance, ending at Sep. 30, 2020 | $ 2,255,089 |  | $ 954 | 1,493,928 | 629,109 |  | 131,098
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends declared per share (in dollars per share) | $ 0.30 |  |  |  |  |  |
Balance, beginning (in shares) at Dec. 31, 2020 | 95,426,364 |  | 95,426,364 |  |  |  |
Balance, beginning at Dec. 31, 2020 | $ 2,307,041 |  | $ 954 | 1,495,053 | 667,944 |  | 143,090
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | 234,048 |  |  |  | 234,048 |  |
Other comprehensive income (loss) | (65,431) |  |  |  |  |  | (65,431)
Cash dividends declared | (90,929) |  |  |  | (90,929) |  |
Stock issuances under stock incentive plans (in shares) |  |  | 86,295 |  |  |  |
Stock issuances under stock incentive plans |  |  | $ 1 | (1) |  |  |
Stock-based compensation and related taxes | $ 2,887 |  |  | 2,887 |  |  |
Balance, ending (in shares) at Sep. 30, 2021 | 95,512,659 |  | 95,512,659 |  |  |  |
Balance, ending at Sep. 30, 2021 | $ 2,387,616 |  | $ 955 | 1,497,939 | 811,063 |  | 77,659
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends declared per share (in dollars per share) | $ 0.95 |  |  |  |  |  |
Balance, beginning (in shares) at Jun. 30, 2021 |  |  | 95,507,234 |  |  |  |
Balance, beginning at Jun. 30, 2021 | $ 2,353,955 |  | $ 955 | 1,496,488 | 766,070 |  | 90,442
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | 75,619 |  |  |  | 75,619 |  |
Other comprehensive income (loss) | (12,783) |  |  |  |  |  | (12,783)
Cash dividends declared | (30,626) |  |  |  | (30,626) |  |
Stock issuances under stock incentive plans (in shares) |  |  | 5,425 |  |  |  |
Stock-based compensation and related taxes | $ 1,451 |  |  | 1,451 |  |  |
Balance, ending (in shares) at Sep. 30, 2021 | 95,512,659 |  | 95,512,659 |  |  |  |
Balance, ending at Sep. 30, 2021 | $ 2,387,616 |  | $ 955 | $ 1,497,939 | $ 811,063 |  | $ 77,659
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends declared per share (in dollars per share) | $ 0.32 |  |  |  |  |  |

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