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Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss, Net [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 291,346 | $ 1,424,448 | $ 777,944 | $ (80,595) |  | $ 2,413,143
Balance, Shares Issued at Dec. 31, 2015 | 87,491 |  |  |  |  |
Net income |  |  | 149,296 |  |  | 149,296
Other comprehensive loss |  |  |  | (39,937) |  | (39,937)
Comprehensive income |  |  | 149,296 | (39,937) |  | 109,359
Cash dividends declared |  |  | (76,551) |  |  | (76,551)
Common stock activity, long-term incentive plan | $ 12 | 12,991 |  |  |  | 13,003
Common stock activity, long-term incentive plan, Shares Issued | 4 |  |  |  |  |
Issuance of stock from dividend reinvestment and stock purchase plans |  | 1,515 |  |  |  | 1,515
Common stock issued in public stock offering (6,325 shares) |  | 259,299 |  |  |  | 259,299
Balance at Dec. 31, 2016 | $ 291,358 | 1,698,253 | 850,689 | (120,532) |  | 2,719,768
Balance, Shares Issued at Dec. 31, 2016 | 87,495 |  |  |  |  |
Net income |  |  | 215,632 |  |  | 215,632
Other comprehensive loss |  |  |  | 11,460 |  | 11,460
Comprehensive income |  |  | 215,632 | 11,460 |  | 227,092
Reclassification of certain tax effects from accumulated other comprehensive loss |  |  | 25,330 | (25,330) | [1] |
Cash dividends declared |  |  | (83,266) |  |  | (83,266)
Common stock activity, long-term incentive plan | $ 1,358 | 16,644 | 133 |  |  | 18,135
Common stock activity, long-term incentive plan, Shares Issued | 408 |  |  |  |  |
Issuance of stock from dividend reinvestment and stock purchase plans |  | 3,220 |  |  |  | 3,220
Balance at Dec. 31, 2017 | $ 292,716 | 1,718,117 | 1,008,518 | (134,402) |  | $ 2,884,949
Balance, Shares Issued at Dec. 31, 2017 | 87,903 |  |  |  |  | 87,903
Net income |  |  | 323,770 |  |  | $ 323,770
Other comprehensive loss |  |  |  | (46,307) |  | (46,307)
Comprehensive income |  |  | 323,770 | (46,307) |  | 277,463
Cash dividends declared |  |  | (88,838) |  |  | (88,838)
Common stock activity, long-term incentive plan |  | 12,482 | 142 |  |  | 12,624
Common stock activity, long-term incentive plan, Shares Issued |  |  |  |  |  |
Issuance of stock from dividend reinvestment and stock purchase plans |  | 3,409 |  |  |  | 3,409
Purchase of common stock under stock buyback program (200,000 shares) |  | (8,267) |  |  |  | (8,267)
Balance at Dec. 31, 2018 | $ 292,716 | $ 1,725,741 | $ 1,243,592 | $ (180,709) |  | $ 3,081,340
Balance, Shares Issued at Dec. 31, 2018 | 87,903 |  |  |  |  | 87,903
[1] | Represents the reclassification of stranded income tax effects to Retained Earnings upon adoption of ASU 2018-02. The adjustment is discussed in more detail later in this footnote.

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