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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in-Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Common Stock in Treasury [Member] | Total | Cumulative Effect Adjustment for ASU Implementation [Member] Common Stock [Member] | Cumulative Effect Adjustment for ASU Implementation [Member] Additional Paid-in-Capital [Member] | Cumulative Effect Adjustment for ASU Implementation [Member] Retained Earnings [Member] | Cumulative Effect Adjustment for ASU Implementation [Member] Accumulated Other Comprehensive (Loss) Income [Member] | Cumulative Effect Adjustment for ASU Implementation [Member] Common Stock in Treasury [Member] | Cumulative Effect Adjustment for ASU Implementation [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 497 | $ 575,466 | $ 621,203 | $ (43,174) | $ (136,083) | $ 1,017,909 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 0 | 0 | 121,021 | 0 | 0 | 121,021 |  |  |  |  |  |
Cash dividends | 0 | 0 | (46,010) | 0 | 0 | (46,010) |  |  |  |  |  |
Net issuance of shares to employee and other stock plans | 0 | (2,968) | 0 | 0 | 2,087 | (881) |  |  |  |  |  |
Stock-based compensation | 0 | 4,210 | 0 | 0 | 0 | 4,210 |  |  |  |  |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 24,148 | 0 | 24,148 |  |  |  |  |  |
Balance at Dec. 31, 2019 | 497 | 576,708 | 696,214 | (19,026) | (133,996) | 1,120,397 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 0 | 0 | 104,388 | 0 | 0 | 104,388 |  |  |  |  |  |
Cash dividends | 0 | 0 | (47,207) | 0 | 0 | (47,207) |  |  |  |  |  |
Purchase of treasury shares | 0 | 0 | 0 | 0 | (7,980) | (7,980) |  |  |  |  |  |
Net issuance of shares to employee and other stock plans | 0 | (3,207) | 0 | 0 | 1,542 | (1,665) |  |  |  |  |  |
Stock-based compensation | 0 | 4,581 | 0 | 0 | 0 | 4,581 |  |  |  |  |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 19,443 | 0 | 19,443 |  |  |  |  |  |
Balance at Dec. 31, 2020 | 497 | 578,082 | 749,056 | 417 | (140,434) | 1,187,618 |  |  |  |  |  |
Balance (ASU 2016-13 [Member]) at Dec. 31, 2020 |  |  |  |  |  |  | $ 0 | $ 0 | $ (4,339) | $ 0 | $ 0 | $ (4,339)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 0 | 0 | 154,885 | 0 | 0 | 154,885 |  |  |  |  |  |
Cash dividends | 0 | 0 | (47,738) | 0 | 0 | (47,738) |  |  |  |  |  |
Purchase of treasury shares | 0 | 0 | 0 | 0 | (21,714) | (21,714) |  |  |  |  |  |
Net issuance of shares to employee and other stock plans | 0 | (5,520) | 0 | 0 | 2,269 | (3,251) |  |  |  |  |  |
Stock-based compensation | 0 | 4,414 | 0 | 0 | 0 | 4,414 |  |  |  |  |  |
Other comprehensive income (loss) | 0 | 0 | 0 | (23,761) | 0 | (23,761) |  |  |  |  |  |
Balance at Dec. 31, 2021 | $ 497 | $ 576,976 | $ 856,203 | $ (23,344) | $ (159,879) | $ 1,250,453 |  |  |  |  |  |

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