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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings (Deficit) | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock | Treasury Stock | Additional Paid-In Capital | Retained Earnings (Deficit) | Total
--- | --- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2019 |  |  | $ 411 | $ (103,960) | $ 320,168 | $ 368,685 | $ 585,304
BALANCE (in shares) at Dec. 31, 2019 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Dec. 31, 2019 |  |  |  | (4,465,448) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | 17,716 | 17,716
Issuance of Stock: |  |  |  |  |  |  |
Issuance of restricted stock & performance stock |  |  |  | $ 1,054 | 801 |  | 1,855
Issuance of restricted stock & performance stock (in shares) |  |  |  | 43,902 |  |  |
Shares received in lieu of tax withholding payment on vested restricted stock |  |  |  | $ (622) |  |  | (622)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares) |  |  |  | (14,722) |  |  |
Stock-based compensation |  |  |  |  | 2,134 |  | 2,134
Dividends |  |  |  |  |  | (3,844) | (3,844)
Share repurchase |  |  |  | $ (8,985) |  |  | (8,985)
Share repurchase (in shares) |  |  |  | (237,359) |  |  |
BALANCE at Mar. 31, 2020 | $ (515) | $ (515) | $ 411 | $ (112,513) | 323,103 | 382,042 | 593,043
BALANCE (in shares) at Mar. 31, 2020 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Mar. 31, 2020 |  |  |  | (4,673,627) |  |  |
BALANCE at Dec. 31, 2019 |  |  | $ 411 | $ (103,960) | 320,168 | 368,685 | 585,304
BALANCE (in shares) at Dec. 31, 2019 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Dec. 31, 2019 |  |  |  | (4,465,448) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | 107,299
BALANCE at Sep. 30, 2020 |  |  | $ 411 | $ (118,551) | 322,304 | 463,962 | 668,126
BALANCE (in shares) at Sep. 30, 2020 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Sep. 30, 2020 |  |  |  | (4,723,672) |  |  |
BALANCE at Mar. 31, 2020 | $ (515) | $ (515) | $ 411 | $ (112,513) | 323,103 | 382,042 | 593,043
BALANCE (in shares) at Mar. 31, 2020 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Mar. 31, 2020 |  |  |  | (4,673,627) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | 39,495 | 39,495
Issuance of Stock: |  |  |  |  |  |  |
Issuance of shares for options exercised |  |  |  | $ 836 | (280) |  | 556
Issuance of shares for options exercised (in shares) |  |  |  | 34,562 |  |  |
Issuance of restricted stock & performance stock |  |  |  | $ 2,048 | (2,048) |  |
Issuance of restricted stock & performance stock (in shares) |  |  |  | 84,987 |  |  |
Shares received in lieu of tax withholding payment on vested restricted stock |  |  |  | $ (454) |  |  | (454)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares) |  |  |  | (13,002) |  |  |
Stock-based compensation |  |  |  |  | 1,644 |  | 1,644
Dividends |  |  |  |  |  | (3,830) | (3,830)
Share repurchase |  |  |  | $ (2,021) |  |  | (2,021)
Share repurchase (in shares) |  |  |  | (52,991) |  |  |
BALANCE at Jun. 30, 2020 |  |  | $ 411 | $ (112,104) | 322,419 | 417,707 | 628,433
BALANCE (in shares) at Jun. 30, 2020 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Jun. 30, 2020 |  |  |  | (4,620,071) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | 50,088 | 50,088
Issuance of Stock: |  |  |  |  |  |  |
Issuance of shares for options exercised |  |  |  | $ 1,324 | (325) |  | 999
Issuance of shares for options exercised (in shares) |  |  |  | 54,207 |  |  |
Stock-based compensation |  |  |  |  | 210 |  | 210
Dividends |  |  |  |  |  | (3,833) | (3,833)
Share repurchase |  |  |  | $ (7,771) |  |  | (7,771)
Share repurchase (in shares) |  |  |  | (157,808) |  |  |
BALANCE at Sep. 30, 2020 |  |  | $ 411 | $ (118,551) | 322,304 | 463,962 | 668,126
BALANCE (in shares) at Sep. 30, 2020 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Sep. 30, 2020 |  |  |  | (4,723,672) |  |  |
BALANCE at Dec. 31, 2020 |  |  | $ 411 | $ (129,243) | 322,451 | 502,810 | $ 696,429
BALANCE (in shares) at Dec. 31, 2020 |  |  | 41,123,365 |  |  |  | 41,123,365
BALANCE (in shares) at Dec. 31, 2020 |  |  |  | (4,935,186) |  |  | 4,935,186
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | 26,491 | $ 26,491
Issuance of Stock: |  |  |  |  |  |  |
Issuance of shares for options exercised |  |  |  | $ 1,616 | (211) |  | 1,405
Issuance of shares for options exercised (in shares) |  |  |  | 61,454 |  |  |
Issuance of restricted stock & performance stock |  |  |  | $ 777 | 1,431 |  | 2,208
Issuance of restricted stock & performance stock (in shares) |  |  |  | 29,544 |  |  |
Shares received in lieu of tax withholding payment on vested restricted stock |  |  |  | $ (854) |  |  | (854)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares) |  |  |  | (11,424) |  |  |
Stock-based compensation |  |  |  |  | 2,472 |  | 2,472
Dividends |  |  |  |  |  | (4,163) | (4,163)
Share repurchase |  |  |  | $ (885) |  |  | (885)
Share repurchase (in shares) |  |  |  | (13,250) |  |  |
BALANCE at Mar. 31, 2021 |  |  | $ 411 | $ (128,589) | 326,143 | 525,138 | 723,103
BALANCE (in shares) at Mar. 31, 2021 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Mar. 31, 2021 |  |  |  | (4,868,862) |  |  |
BALANCE at Dec. 31, 2020 |  |  | $ 411 | $ (129,243) | 322,451 | 502,810 | $ 696,429
BALANCE (in shares) at Dec. 31, 2020 |  |  | 41,123,365 |  |  |  | 41,123,365
BALANCE (in shares) at Dec. 31, 2020 |  |  |  | (4,935,186) |  |  | 4,935,186
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | $ 105,753
BALANCE at Sep. 30, 2021 |  |  | $ 411 | $ (150,987) | 326,493 | 595,872 | $ 771,789
BALANCE (in shares) at Sep. 30, 2021 |  |  | 41,123,365 |  |  |  | 41,123,365
BALANCE (in shares) at Sep. 30, 2021 |  |  |  | (5,080,907) |  |  | 5,080,907
BALANCE at Mar. 31, 2021 |  |  | $ 411 | $ (128,589) | 326,143 | 525,138 | $ 723,103
BALANCE (in shares) at Mar. 31, 2021 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Mar. 31, 2021 |  |  |  | (4,868,862) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | 32,965 | 32,965
Issuance of Stock: |  |  |  |  |  |  |
Issuance of shares for options exercised |  |  |  | $ 1,853 | 191 |  | 2,044
Issuance of shares for options exercised (in shares) |  |  |  | 69,342 |  |  |
Issuance of restricted stock & performance stock |  |  |  | $ 1,904 | (1,904) |  |
Issuance of restricted stock & performance stock (in shares) |  |  |  | 71,816 |  |  |
Shares received in lieu of tax withholding payment on vested restricted stock |  |  |  | $ (1,509) |  |  | (1,509)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares) |  |  |  | (19,989) |  |  |
Stock-based compensation |  |  |  |  | 1,749 |  | 1,749
Dividends |  |  |  |  |  | (4,178) | (4,178)
Share repurchase |  |  |  | $ (2,162) |  |  | (2,162)
Share repurchase (in shares) |  |  |  | (27,092) |  |  |
BALANCE at Jun. 30, 2021 |  |  | $ 411 | $ (128,503) | 326,179 | 553,925 | 752,012
BALANCE (in shares) at Jun. 30, 2021 |  |  | 41,123,365 |  |  |  |
BALANCE (in shares) at Jun. 30, 2021 |  |  |  | (4,774,785) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | 46,297 | 46,297
Issuance of Stock: |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  | 314 |  | 314
Dividends |  |  |  |  |  | (4,350) | (4,350)
Share repurchase |  |  |  | $ (22,484) |  |  | (22,484)
Share repurchase (in shares) |  |  |  | (306,122) |  |  |
BALANCE at Sep. 30, 2021 |  |  | $ 411 | $ (150,987) | $ 326,493 | $ 595,872 | $ 771,789
BALANCE (in shares) at Sep. 30, 2021 |  |  | 41,123,365 |  |  |  | 41,123,365
BALANCE (in shares) at Sep. 30, 2021 |  |  |  | (5,080,907) |  |  | 5,080,907

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