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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ 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 (Loss), Net [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 | $ 3,467,685 | $ (44,087) | $ 309,513 | $ 1,736,664 | $ 1,476,232 | $ (44,087) | $ (54,724)
Balance, Shares Issued at Dec. 31, 2019 |  |  | 92,947 |  |  |  |
Net income (loss) | (148,749) |  |  |  | (148,749) |  |
Other comprehensive loss | 153,662 |  |  |  |  |  | 153,662
Comprehensive income | 4,913 |  |  |  | (148,749) |  | 153,662
Cash dividends declared | (71,620) |  |  |  | (71,620) |  |
Common stock activity, long-term incentive plans | 16,261 |  |  | 16,159 | 102 |  |
Net settlement of accelerated share repurchase agreement (1,001,472 shares) | 12,110 |  |  | 12,110 |  |  |
Repurchase of common stock | (12,716) |  |  | (12,716) |  |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 3,098 |  |  | 3,098 |  |  |
Balance at Sep. 30, 2020 | 3,375,644 |  | $ 309,513 | 1,755,315 | 1,211,878 |  | 98,938
Balance, Shares Issued at Sep. 30, 2020 |  |  | 92,947 |  |  |  |
Balance at Jun. 30, 2020 | 3,316,157 |  | $ 309,513 | 1,747,640 | 1,156,278 |  | 102,726
Balance, Shares Issued at Jun. 30, 2020 |  |  | 92,947 |  |  |  |
Net income (loss) | 79,356 |  |  |  | 79,356 |  |
Other comprehensive loss | (3,788) |  |  |  |  |  | (3,788)
Comprehensive income | 75,568 |  |  |  | 79,356 |  | (3,788)
Cash dividends declared | (23,803) |  |  |  | (23,803) |  |
Common stock activity, long-term incentive plans | 6,642 |  |  | 6,595 | 47 |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 1,080 |  |  | 1,080 |  |  |
Balance at Sep. 30, 2020 | 3,375,644 |  | $ 309,513 | 1,755,315 | 1,211,878 |  | 98,938
Balance, Shares Issued at Sep. 30, 2020 |  |  | 92,947 |  |  |  |
Balance at Dec. 31, 2020 | $ 3,439,025 |  | $ 309,513 | 1,757,937 | 1,291,506 |  | 80,069
Balance, Shares Issued at Dec. 31, 2020 | 92,947 |  | 92,947 |  |  |  |
Net income (loss) | $ 325,472 |  |  |  | 325,472 |  |
Other comprehensive loss | (79,871) |  |  |  |  |  | (79,871)
Comprehensive income | 245,601 |  |  |  | 325,472 |  | (79,871)
Cash dividends declared | (72,046) |  |  |  | (72,046) |  |
Common stock activity, long-term incentive plans | 16,755 |  |  | 16,506 | 249 |  |
Repurchase of common stock | (2,509) |  |  | (2,509) |  |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 2,940 |  |  | 2,940 |  |  |
Balance at Sep. 30, 2021 | $ 3,629,766 |  | $ 309,513 | 1,774,874 | 1,545,181 |  | 198
Balance, Shares Issued at Sep. 30, 2021 | 92,947 |  | 92,947 |  |  |  |
Balance at Jun. 30, 2021 | $ 3,562,901 |  | $ 309,513 | 1,770,973 | 1,439,553 |  | 42,862
Balance, Shares Issued at Jun. 30, 2021 |  |  | 92,947 |  |  |  |
Net income (loss) | 129,582 |  |  |  | 129,582 |  |
Other comprehensive loss | (42,664) |  |  |  |  |  | (42,664)
Comprehensive income | 86,918 |  |  |  | 129,582 |  | (42,664)
Cash dividends declared | (24,002) |  |  |  | (24,002) |  |
Common stock activity, long-term incentive plans | 5,480 |  |  | 5,432 | 48 |  |
Repurchase of common stock | (2,509) |  |  | (2,509) |  |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 978 |  |  | 978 |  |  |
Balance at Sep. 30, 2021 | $ 3,629,766 |  | $ 309,513 | $ 1,774,874 | $ 1,545,181 |  | $ 198
Balance, Shares Issued at Sep. 30, 2021 | 92,947 |  | 92,947 |  |  |  |

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