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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock | Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-In Capital | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Treasury Stock | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2019 | $ 288 | $ 288 | $ 333,943 | $ 333,943 | $ (198) | $ 532,989 | $ 533,187 | $ (104,578) | $ (104,578) | $ 203 | $ 203 | $ (198) | $ 762,845 | $ 763,043
Balances (in shares) at Dec. 31, 2019 | 28,811 | 28,811 |  |  |  |  |  | 3,405 | 3,405 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | 1,902 |  |  |  |  |  |  | 1,902
Other comprehensive income, net of tax |  |  |  |  |  |  |  |  |  |  | (2,467) |  |  | (2,467)
Issuance of common stock under share-based compensation plans (in shares) |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Tax effect of share-based compensation plans |  |  |  | (60) |  |  |  |  |  |  |  |  |  | (60)
Share-based compensation expense |  |  |  | 2,181 |  |  |  |  |  |  |  |  |  | 2,181
Purchase of treasury stock |  |  |  |  |  |  |  |  | $ (3,162) |  |  |  |  | (3,162)
Purchase of treasury stock (in shares) |  |  |  |  |  |  |  |  | 150 |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  | (2,033) |  |  |  |  |  |  | (2,033)
Balances at Mar. 31, 2020 |  | $ 288 |  | 336,064 |  |  | 532,858 |  | $ (107,740) |  | (2,264) |  |  | 759,206
Balances (in shares) at Mar. 31, 2020 |  | 28,817 |  |  |  |  |  |  | 3,555 |  |  |  |  |
Balances at Dec. 31, 2020 |  | $ 290 |  | 342,354 |  |  | 595,932 |  | $ (111,173) |  | 1,190 |  |  | 828,593
Balances (in shares) at Dec. 31, 2020 |  | 29,045 |  |  |  |  |  |  | 3,657 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | 23,361 |  |  |  |  |  |  | 23,361
Other comprehensive income, net of tax |  |  |  |  |  |  |  |  |  |  | 804 |  |  | 804
Issuance of common stock under share-based compensation plans |  | $ 1 |  | (1) |  |  |  |  |  |  |  |  |  |
Issuance of common stock under share-based compensation plans (in shares) |  | 12 |  |  |  |  |  |  |  |  |  |  |  |
Tax effect of share-based compensation plans |  |  |  | (165) |  |  |  |  |  |  |  |  |  | (165)
Share-based compensation expense |  |  |  | 2,354 |  |  |  |  |  |  |  |  |  | 2,354
Purchase of treasury stock |  |  |  |  |  |  |  |  | $ (1,001) |  |  |  |  | (1,001)
Purchase of treasury stock (in shares) |  |  |  |  |  |  |  |  | 15 |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  | (2,037) |  |  |  |  |  |  | (2,037)
Balances at Mar. 31, 2021 |  | $ 291 |  | $ 344,542 |  |  | $ 617,256 |  | $ (112,174) |  | $ 1,994 |  |  | $ 851,909
Balances (in shares) at Mar. 31, 2021 |  | 29,057 |  |  |  |  |  |  | 3,672 |  |  |  |  |

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