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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Retained Earnings (Accumulated Deficit). Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings (Accumulated Deficit). | Accumulated other comprehensive income (loss) | Treasury Stock | Cumulative Effect, Period of Adoption, Adjustment | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 56 | $ 1,248,216 | $ (15,922) | $ (14,813) | $ 14,960 | $ (27,985) | $ (15,922) | $ 1,220,434
Beginning Balance (in shares) at Dec. 31, 2019 | 54,788,772 |  |  |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |  |  |
Net income |  |  |  | 71,999 |  |  |  | 71,999
Other comprehensive income (loss) |  |  |  |  | 20,565 |  |  | 20,565
Repurchase of stock |  |  |  |  |  | (9,669) |  | (9,669)
Repurchase of stock (in shares) | (407,850) |  |  |  |  |  |  |
Issuance of treasury stock for employee stock purchase plan |  | (68) |  |  |  | 504 |  | 436
Issuance of treasury stock for employee stock purchase plan (in shares) | 26,651 |  |  |  |  |  |  |
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax |  | (2,648) |  |  |  | 2,013 |  | (635)
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax (in shares) | 106,589 |  |  |  |  |  |  |
Net issuance of treasury stock for stock options exercised, net of shares redeemed and related tax |  | (51) |  |  |  | 152 |  | 101
Net issuance of treasury stock for stock options exercised, net of shares redeemed and related tax (in shares) | 8,069 |  |  |  |  |  |  |
Cash dividends common stock |  |  |  | (36,017) |  |  |  | (36,017)
Stock dividend equivalents restricted stock units |  | 529 |  | (529) |  |  |  |
Stock-based compensation |  | 4,413 |  |  |  |  |  | 4,413
Ending balance at Sep. 30, 2020 | $ 56 | 1,250,391 |  | 4,718 | 35,525 | (34,985) |  | 1,255,705
Ending Balance (in shares) at Sep. 30, 2020 | 54,522,231 |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2020 | $ 56 | 1,248,045 |  | (13,951) | 37,037 | (35,103) |  | 1,236,084
Beginning Balance (in shares) at Jun. 30, 2020 | 54,516,000 |  |  |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |  |  |
Net income |  |  |  | 30,829 |  |  |  | 30,829
Other comprehensive income (loss) |  |  |  |  | (1,512) |  |  | (1,512)
Issuance of treasury stock for employee stock purchase plan |  | (23) |  |  |  | 116 |  | 93
Issuance of treasury stock for employee stock purchase plan (in shares) | 6,119 |  |  |  |  |  |  |
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax |  | (2) |  |  |  | 2 |  |
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax (in shares) | 112 |  |  |  |  |  |  |
Cash dividends common stock |  |  |  | (11,994) |  |  |  | (11,994)
Stock dividend equivalents restricted stock units |  | 166 |  | (166) |  |  |  |
Stock-based compensation |  | 2,205 |  |  |  |  |  | 2,205
Ending balance at Sep. 30, 2020 | $ 56 | 1,250,391 |  | 4,718 | 35,525 | (34,985) |  | 1,255,705
Ending Balance (in shares) at Sep. 30, 2020 | 54,522,231 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 56 | 1,253,360 |  | 20,830 | 33,309 | (37,486) |  | 1,270,069
Beginning Balance (in shares) at Dec. 31, 2020 | 54,404,379 |  |  |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |  |  |
Net income |  |  |  | 93,523 |  |  |  | 93,523
Other comprehensive income (loss) |  |  |  |  | (34,675) |  |  | (34,675)
Stock issued in acquisition, net of stock issuance costs (in shares) | 2,206,237 |  |  |  |  |  |  |
Stock issued in acquisition, net of stock issuance costs | $ 2 | 58,953 |  |  |  |  |  | 58,955
Repurchase of stock |  |  |  |  |  | (22,038) |  | (22,038)
Repurchase of stock (in shares) | (905,000) |  |  |  |  |  |  |
Issuance of treasury stock for employee stock purchase plan |  | (16) |  |  |  | 377 |  | 361
Issuance of treasury stock for employee stock purchase plan (in shares) | 14,658 |  |  |  |  |  |  |
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax |  | (3,738) |  |  |  | 2,850 |  | (888)
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax (in shares) | 106,710 |  |  |  |  |  |  |
Cash dividends common stock |  |  |  | (37,953) |  |  |  | (37,953)
Stock dividend equivalents restricted stock units |  | 757 |  | (757) |  |  |  |
Stock-based compensation |  | 5,722 |  |  |  |  |  | 5,722
Ending balance at Sep. 30, 2021 | $ 58 | 1,315,038 |  | 75,643 | (1,366) | (56,297) |  | 1,333,076
Ending Balance (in shares) at Sep. 30, 2021 | 55,826,984 |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2021 | $ 58 | 1,316,716 |  | 62,926 | 10,725 | (44,734) |  | 1,345,691
Beginning Balance (in shares) at Jun. 30, 2021 | 56,330,616 |  |  |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |  |  |
Net income |  |  |  | 25,941 |  |  |  | 25,941
Other comprehensive income (loss) |  |  |  |  | (12,091) |  |  | (12,091)
Stock issued in acquisition, net of stock issuance costs |  | (29) |  |  |  |  |  | (29)
Repurchase of stock |  |  |  |  |  | (14,790) |  | (14,790)
Repurchase of stock (in shares) | (625,000) |  |  |  |  |  |  |
Issuance of treasury stock for employee stock purchase plan |  | (16) |  |  |  | 377 |  | 361
Issuance of treasury stock for employee stock purchase plan (in shares) | 14,658 |  |  |  |  |  |  |
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax |  | (3,738) |  |  |  | 2,850 |  | (888)
Net issuance of treasury stock for restricted/deferred stock unit vesting and related tax (in shares) | 106,710 |  |  |  |  |  |  |
Cash dividends common stock |  |  |  | (12,956) |  |  |  | (12,956)
Stock dividend equivalents restricted stock units |  | 268 |  | (268) |  |  |  |
Stock-based compensation |  | 1,837 |  |  |  |  |  | 1,837
Ending balance at Sep. 30, 2021 | $ 58 | $ 1,315,038 |  | $ 75,643 | $ (1,366) | $ (56,297) |  | $ 1,333,076
Ending Balance (in shares) at Sep. 30, 2021 | 55,826,984 |  |  |  |  |  |  |

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