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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 Income (Loss), Net [Member] | Total
--- | --- | --- | --- | --- | ---
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 |  |  | 160,183 |  | 160,183
Other comprehensive income |  |  |  | 22,381 | 22,381
Comprehensive income |  |  | 160,183 | 22,381 | 182,564
Cash dividends declared |  |  | (62,400) |  | (62,400)
Common stock activity, long-term incentive plan |  | 20,910 | 119 |  | 21,029
Issuance of stock from dividend reinvestment |  | 2,314 |  |  | 2,314
Balance at Sep. 30, 2017 | $ 291,358 | 1,721,477 | 948,591 | (98,151) | 2,863,275
Balance, Shares Issued at Sep. 30, 2017 | 87,495 |  |  |  |
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 |  |  | 227,530 |  | $ 227,530
Other comprehensive income |  |  |  | (85,777) | (85,777)
Comprehensive income |  |  | 227,530 | (85,777) | 141,753
Cash dividends declared |  |  | (65,287) |  | (65,287)
Common stock activity, long-term incentive plan |  | 14,832 | 136 |  | 14,968
Issuance of stock from dividend reinvestment |  | 2,495 |  |  | 2,495
Balance at Sep. 30, 2018 | $ 292,716 | $ 1,735,444 | $ 1,170,897 | $ (220,179) | $ 2,978,878
Balance, Shares Issued at Sep. 30, 2018 | 87,903 |  |  |  | 87,903

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- Definition Stock Issued During Period, Value, Share-based Compensation, Dividends Previous Paid on Shares Forfeited + References No definition available. + Details
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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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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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- Definition Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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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