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Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Shares, Outstanding |  | 73,020 |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member] | $ 0 |  | $ (157) | $ 157 |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.74 |  |  |  |
Balance, value at Dec. 31, 2017 | $ 1,949,922 | $ 1,634,705 | 337,442 | (22,225) |
Net income | 128,134 |  | 128,134 |  |
Other comprehensive income (loss) | (47,941) |  |  | (47,941) |
Issuance of common stock - stock option and other plans, shares |  | 45 |  |  |
Issuance of common stock - stock option and other plans, value | $ 1,857 | $ 1,857 |  |  |
Stock Adjustment Deferred Compensation - Shares | 0 |  |  |  |
Stock Adjustment Value Deferred Compensation | $ 7 |  |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, shares |  | 257 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 6,231 | $ 6,231 |  |  |
Stock Repurchased During Period, Shares |  | (62) |  |  |
Stock Repurchased and Retired During Period, Value | (2,660) | $ (2,660) |  |  |
Cash dividends paid on common stock | (54,155) |  | (54,155) |  |
Balance, value at Sep. 30, 2018 | $ 1,981,395 | $ 1,640,140 | 411,264 | (70,009) | $ 0
Shares, Outstanding |  | 73,245 |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.26 |  |  |  |
Balance, value at Jun. 30, 2018 | $ 1,964,881 | $ 1,636,903 | 383,899 | (55,921) |
Net income | 46,415 |  | 46,415 |  |
Other comprehensive income (loss) | (14,088) |  |  | (14,088) |
Issuance of common stock - stock option and other plans, shares |  | 26 |  |  |
Issuance of common stock - stock option and other plans, value | $ 1,121 | $ 1,121 |  |  |
Stock Adjustment Deferred Compensation - Shares | 0 |  |  |  |
Stock Adjustment Value Deferred Compensation | $ 1 |  |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, shares |  | (11) |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 2,148 | $ 2,148 |  |  |
Stock Repurchased During Period, Shares |  | 0 |  |  |
Stock Repurchased and Retired During Period, Value | (33) | $ (33) |  |  |
Cash dividends paid on common stock | (19,050) |  | (19,050) |  |
Balance, value at Sep. 30, 2018 | $ 1,981,395 | $ 1,640,140 | 411,264 | (70,009) | 0
Shares, Outstanding |  | 73,260 |  |  |
Shares, Outstanding |  | 73,249 |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-02 [Member] |  |  | 782 |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 1.12 |  |  |  |
Balance, value at Dec. 31, 2018 | $ 2,033,649 | $ 1,642,246 | 426,708 | (35,305) | 0
Net income | 148,322 |  | 148,322 |  |
Other comprehensive income (loss) | 100,189 |  |  | 100,189 |
Issuance of common stock - stock option and other plans, shares |  | 58 |  |  |
Issuance of common stock - stock option and other plans, value | 2,025 | $ 2,025 |  |  |
Stock Adjustment Deferred Compensation - Shares |  | 0 |  |  |
Stock Adjustment Value Deferred Compensation | 2 | $ 2 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, shares |  | 354 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 6,827 | $ 6,827 |  |  |
Stock Repurchased During Period, Shares |  | (73) |  |  |
Stock Repurchased and Retired During Period, Value | (2,765) | $ (2,765) |  |  |
Cash dividends paid on common stock | $ (82,074) |  | (82,074) |  |
Treasury Stock, Shares, Acquired | (1,300) | (1,300) |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ (45,380) |  |  |  | (45,380)
Balance, value at Sep. 30, 2019 | $ 2,161,577 | $ 1,648,335 | 493,738 | 64,884 | (45,380)
Shares, Outstanding |  | 72,924 |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.28 |  |  |  |
Balance, value at Jun. 30, 2019 | $ 2,133,638 | $ 1,644,922 | 463,429 | 47,150 | (21,863)
Net income | 50,727 |  | 50,727 |  |
Other comprehensive income (loss) | 17,734 |  |  | 17,734 |
Issuance of common stock - stock option and other plans, shares |  | 31 |  |  |
Issuance of common stock - stock option and other plans, value | 1,132 | $ 1,132 |  |  |
Stock Adjustment Deferred Compensation - Shares |  | 0 |  |  |
Stock Adjustment Value Deferred Compensation | 1 | $ 1 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, shares |  | 9 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 2,299 | $ 2,299 |  |  |
Stock Repurchased During Period, Shares |  | 0 |  |  |
Stock Repurchased and Retired During Period, Value | (19) | $ (19) |  |  |
Cash dividends paid on common stock | $ (20,418) |  | (20,418) |  |
Treasury Stock, Shares, Acquired | (676) | (676) |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ (23,517) |  |  |  | 23,517
Balance, value at Sep. 30, 2019 | $ 2,161,577 | $ 1,648,335 | $ 493,738 | $ 64,884 | $ (45,380)
Shares, Outstanding |  | 72,288 |  |  |

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