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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Earnings Reinvested in the Business [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-In Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Earnings Reinvested in the Business [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 5,396 | $ 98,425 | $ 1,536,100 | $ (595,324) | $ (163,008) | $ 881,589 |  |  |  |  |  |
Beginning balance (ASU 2016-13 [Member]) at Dec. 31, 2019 |  |  |  |  |  |  | $ 0 | $ 0 | $ (853) | $ 0 | $ 0 | $ (853)
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  | 11,682,636 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 0 | 0 | 20,773 | $ 0 | 0 | 20,773 |  |  |  |  |  |
Other comprehensive loss | 0 | 0 | 0 | 0 | (44,353) | (44,353) |  |  |  |  |  |
Cash dividends paid | 0 | 0 | (16,500) | 0 | 0 | (16,500) |  |  |  |  |  |
Share-based compensation | 0 | 1,177 | 0 | 0 | 0 | 1,177 |  |  |  |  |  |
Non-vested stock issued upon vesting | 0 | (724) | 0 | $ 724 | 0 | 0 |  |  |  |  |  |
Non-vested stock issued upon vesting (in shares) |  |  |  | (14,200) |  |  |  |  |  |  |  |
Benefit plans | 0 | 241 | 0 | $ 833 | 0 | 1,074 |  |  |  |  |  |
Benefit plans (in shares) |  |  |  | (16,344) |  |  |  |  |  |  |  |
Other | 0 | (39) | 0 | $ (210) | 0 | (249) |  |  |  |  |  |
Other (in shares) |  |  |  | 4,114 |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 5,396 | 99,080 | 1,539,520 | $ (593,977) | (207,361) | 842,658 |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  | 11,656,206 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | 5,396 | 102,909 | 1,578,662 | $ (593,540) | (159,091) | 934,336 |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2020 |  |  |  | 11,647,627 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 0 | 0 | 31,668 | $ 0 | 0 | 31,668 |  |  |  |  |  |
Other comprehensive loss | 0 | 0 | 0 | 0 | (15,139) | (15,139) |  |  |  |  |  |
Cash dividends paid | 0 | 0 | (16,535) | 0 | 0 | (16,535) |  |  |  |  |  |
Share-based compensation | 0 | 2,113 | 0 | 0 | 0 | 2,113 |  |  |  |  |  |
Non-vested stock issued upon vesting | 0 | (563) | 0 | $ 563 | 0 | 0 |  |  |  |  |  |
Non-vested stock issued upon vesting (in shares) |  |  |  | (11,045) |  |  |  |  |  |  |  |
Benefit plans | 0 | 338 | 0 | $ 756 | 0 | 1,094 |  |  |  |  |  |
Benefit plans (in shares) |  |  |  | (14,791) |  |  |  |  |  |  |  |
Purchase of treasury stock | 0 | 0 | 0 | $ (11,665) | 0 | (11,665) |  |  |  |  |  |
Purchase of treasury stock (in shares) |  |  |  | 151,843 |  |  |  |  |  |  |  |
Other | 0 | (72) | 0 | $ (154) | 0 | (226) |  |  |  |  |  |
Other (in shares) |  |  |  | 3,020 |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2021 | $ 5,396 | $ 104,725 | $ 1,593,795 | $ (604,040) | $ (174,230) | $ 925,646 |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2021 |  |  |  | 11,776,654 |  |  |  |  |  |  |  |

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