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Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU | Accounting Standards Update 2016-01 | $ 0 |  |  | $ (157) | $ 157
Balance, value at Dec. 31, 2017 | 1,949,922 | $ 1,634,705 | $ 0 | 337,442 | (22,225)
Balance (in shares) at Dec. 31, 2017 |  | 73,020 |  |  |
Net income | 172,882 |  |  | 172,882 |
Other comprehensive income | (13,237) |  |  |  | (13,237)
Issuance of common stock - stock option and other plans, shares |  | 46 |  |  |
Issuance of common stock - stock option and other plans, value | 1,857 | $ 1,857 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, shares |  | 246 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, value | 8,354 | $ 8,354 |  |  |
Activity in deferred compensation | 7 |  |  |  |
Purchase and retirement of common stock, shares |  | (63) |  |  |
Purchase and retirement of common stock, value | (2,677) | $ (2,677) |  |  |
Cash dividends declared on common stock | (83,459) |  |  | (83,459) |
Balance, value at Dec. 31, 2018 | $ 2,033,649 | $ 1,642,246 | 0 | 426,708 | (35,305)
Balance (in shares) at Dec. 31, 2018 |  | 73,249 |  |  |
Common Stock, Dividends, Per Share, paid | $ 1.14 |  |  |  |
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU | Accounting Standards Update 2016-02 | $ 782 |  |  | 782 |
Net income | 194,451 |  |  | 194,451 |
Other comprehensive income | 75,672 |  |  |  | 75,672
Issuance of common stock - stock option and other plans, shares |  | 59 |  |  |
Issuance of common stock - stock option and other plans, value | 2,025 | $ 2,025 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, shares |  | 343 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, value | 9,271 | $ 9,271 |  |  |
Activity in deferred compensation | 3 | $ 3 |  |  |
Purchase and retirement of common stock, shares |  | (74) |  |  |
Purchase and retirement of common stock, value | (2,792) | $ (2,792) |  |  |
Cash dividends declared on common stock | (102,265) |  |  | (102,265) |
Purchase of treasury stock, shares |  | 1,453 |  |  |
Purchase of treasury stock, value | (50,834) |  | (50,834) |  |
Balance, value at Dec. 31, 2019 | $ 2,159,962 | $ 1,650,753 | (50,834) | 519,676 | 40,367
Balance (in shares) at Dec. 31, 2019 |  | 72,124 |  |  |
Common Stock, Dividends, Per Share, paid | $ 1.40 |  |  |  |
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU | Accounting Standards Update 2016-13 | $ (2,500) |  |  | (2,457) |
Net income | 154,244 |  |  | 154,244 |
Other comprehensive income | 141,828 |  |  |  | 141,828
Issuance of common stock - stock option and other plans, shares |  | 65 |  |  |
Issuance of common stock - stock option and other plans, value | 2,028 | $ 2,028 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, shares |  | 208 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, value | 10,737 | $ 10,737 |  |  |
Activity in deferred compensation | 2 | $ 2 |  |  |
Purchase and retirement of common stock, shares |  | (68) |  |  |
Purchase and retirement of common stock, value | (2,522) | $ (2,522) |  |  |
Cash dividends declared on common stock | $ (96,215) |  |  | (96,215) |
Purchase of treasury stock, shares | 731 | 731 |  |  |
Purchase of treasury stock, value | $ (20,000) |  | (20,000) |  |
Balance, value at Dec. 31, 2020 | $ 2,347,607 | $ 1,660,998 | $ (70,834) | $ 575,248 | $ 182,195
Balance (in shares) at Dec. 31, 2020 |  | 71,598 |  |  |
Common Stock, Dividends, Per Share, paid | $ 1.34 |  |  |  |

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