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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Earnings
--- | --- | --- | --- | --- | ---
Balance beginning of period (in shares) at Dec. 31, 2019 |  | 55,798 |  |  |
Balance beginning of period at Dec. 31, 2019 | $ 1,269,813 | $ 558 | $ 644,412 | $ (210,051) | $ 834,894
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 11,572 |  |  |  | 11,572
Other comprehensive (loss) income | (59,306) |  |  | (59,306) |
Stock-based compensation | 3,291 |  | 3,291 |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares) |  | 59 |  |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings | (2,224) | $ 1 | (2,225) |  |
Repurchases of common stock (in shares) |  | (302) |  |  |
Repurchases of common stock | (17,341) | $ (3) | (17,338) |  |
Balance ending of period (in shares) at Mar. 31, 2020 |  | 55,555 |  |  |
Balance ending of period at Mar. 31, 2020 | 1,205,805 | $ 556 | 628,140 | (269,357) | 846,466
Balance beginning of period (in shares) at Dec. 31, 2019 |  | 55,798 |  |  |
Balance beginning of period at Dec. 31, 2019 | 1,269,813 | $ 558 | 644,412 | (210,051) | 834,894
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 95,505 |  |  |  |
Other comprehensive (loss) income | (29,393) |  |  |  |
Balance ending of period (in shares) at Sep. 30, 2020 |  | 55,246 |  |  |
Balance ending of period at Sep. 30, 2020 | 1,304,715 | $ 552 | 613,208 | (239,444) | 930,399
Balance beginning of period (in shares) at Mar. 31, 2020 |  | 55,555 |  |  |
Balance beginning of period at Mar. 31, 2020 | 1,205,805 | $ 556 | 628,140 | (269,357) | 846,466
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 29,023 |  |  |  | 29,023
Other comprehensive (loss) income | 17,528 |  |  | 17,528 |
Stock-based compensation | 2,786 |  | 2,786 |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares) |  | 58 |  |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings | (1,171) |  | (1,171) |  |
Balance ending of period (in shares) at Jun. 30, 2020 |  | 55,613 |  |  |
Balance ending of period at Jun. 30, 2020 | 1,253,971 | $ 556 | 629,755 | (251,829) | 875,489
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 54,910 |  |  |  | 54,910
Other comprehensive (loss) income | 12,385 |  |  | 12,385 |
Stock-based compensation | 6,662 |  | 6,662 |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares) |  | 35 |  |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings | (1,012) |  | (1,012) |  |
Repurchases of common stock (in shares) |  | (402) |  |  |
Repurchases of common stock | (22,201) | $ (4) | (22,197) |  |
Balance ending of period (in shares) at Sep. 30, 2020 |  | 55,246 |  |  |
Balance ending of period at Sep. 30, 2020 | 1,304,715 | $ 552 | 613,208 | (239,444) | 930,399
Balance beginning of period (in shares) at Dec. 31, 2020 |  | 54,773 |  |  |
Balance beginning of period at Dec. 31, 2020 | 1,341,551 | $ 548 | 582,749 | (211,477) | 969,731
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 21,736 |  |  |  | 21,736
Other comprehensive (loss) income | 11,948 |  |  | 11,948 |
Stock-based compensation | 3,480 |  | 3,480 |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares) |  | 78 |  |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings | (3,719) | $ 1 | (3,720) |  |
Repurchases of common stock (in shares) |  | (300) |  |  |
Repurchases of common stock | (26,546) | $ (3) | (26,543) |  |
Balance ending of period (in shares) at Mar. 31, 2021 |  | 54,551 |  |  |
Balance ending of period at Mar. 31, 2021 | 1,348,450 | $ 546 | 555,966 | (199,529) | 991,467
Balance beginning of period (in shares) at Dec. 31, 2020 |  | 54,773 |  |  |
Balance beginning of period at Dec. 31, 2020 | 1,341,551 | $ 548 | 582,749 | (211,477) | 969,731
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 154,254 |  |  |  |
Other comprehensive (loss) income | 10,761 |  |  |  |
Balance ending of period (in shares) at Sep. 30, 2021 |  | 54,410 |  |  |
Balance ending of period at Sep. 30, 2021 | 1,463,560 | $ 544 | 539,747 | (200,716) | 1,123,985
Balance beginning of period (in shares) at Mar. 31, 2021 |  | 54,551 |  |  |
Balance beginning of period at Mar. 31, 2021 | 1,348,450 | $ 546 | 555,966 | (199,529) | 991,467
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 67,075 |  |  |  | 67,075
Other comprehensive (loss) income | 10,640 |  |  | 10,640 |
Stock-based compensation | 3,305 |  | 3,305 |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares) |  | 42 |  |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings | (1,020) |  | (1,020) |  |
Repurchases of common stock (in shares) |  | (200) |  |  |
Repurchases of common stock | (18,863) | $ (2) | (18,861) |  |
Balance ending of period (in shares) at Jun. 30, 2021 |  | 54,393 |  |  |
Balance ending of period at Jun. 30, 2021 | 1,409,587 | $ 544 | 539,390 | (188,889) | 1,058,542
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 65,443 |  |  |  | 65,443
Other comprehensive (loss) income | (11,827) |  |  | (11,827) |
Stock-based compensation | 6,001 |  | 6,001 |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares) |  | 50 |  |  |
Issuance of common stock for restricted share vesting, net of employee tax withholdings | (2,644) |  | (2,644) |  |
Repurchases of common stock (in shares) |  | (33) |  |  |
Repurchases of common stock | (3,000) | $ 0 | (3,000) |  |
Balance ending of period (in shares) at Sep. 30, 2021 |  | 54,410 |  |  |
Balance ending of period at Sep. 30, 2021 | $ 1,463,560 | $ 544 | $ 539,747 | $ (200,716) | $ 1,123,985

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