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v3.8.0.1

Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Accumulated Other ComprehensiveLoss, Net [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 291,307 | $ 1,507,673 | $ 723,496 | $ (50,074) |  | $ 2,472,402
Balance, Shares Issued at Dec. 31, 2014 | 87,480 |  |  |  |  |
Net income |  |  | 131,461 |  |  | 131,461
Other comprehensive loss, net of tax |  |  |  | (30,521) |  | (30,521)
Comprehensive income |  |  | 131,461 | (30,521) |  | 100,940
Cash dividends declared ($0.96 per common share) |  |  | (77,013) |  |  | (77,013)
Common stock activity, long-term incentive plan | $ 39 | 12,388 |  |  |  | 12,427
Common stock activity, long-term incentive plan, Shares Issued | 11 |  |  |  |  |
Purchase of common stock under stock buyback program (3,305 shares) |  | (95,613) |  |  |  | (95,613)
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, net of tax |  |  |  | (39,937) |  | (39,937)
Comprehensive income |  |  | 149,296 | (39,937) |  | 109,359
Cash dividends declared ($0.96 per common share) |  |  | (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 plan |  | 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 |  |  |  |  | 87,495
Net income |  |  | 215,632 |  |  | $ 215,632
Other comprehensive loss, net of tax |  |  |  | 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 ($0.96 per common share) |  |  | (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 plan |  | 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
[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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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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