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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Common Stock Held in Treasury | Common Stock Held in Treasury
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2020 |  | 49,276 |  |  |  | 8,238 |
Balance at beginning of period at Dec. 31, 2020 | $ 1,283,815 | $ 493 | $ 1,221,788 | $ 789,303 | $ (118,432) | $ (609,337) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Shares issued under share-based compensation plan | (1,663) |  | (7,090) |  |  | $ 5,427 |
Shares issued under share-based compensation plan (shares) |  |  |  |  |  | (73) |
Share-based compensation expense | 3,625 |  | 3,625 |  |  |  |
Net income | 33,715 |  |  | 33,715 |  |  |
Cash dividends | (11,097) |  |  | (11,097) |  |  |
Currency translation adjustment | (12,335) |  |  |  | (12,335) |  |
Purchases of treasury stock (shares) |  |  |  |  |  | 84 |
Purchases of treasury stock | (4,967) |  |  |  |  | $ (4,967) |
Balance at end of period (shares) at Mar. 31, 2021 |  | 49,276 |  |  |  | 8,249 |
Balance at end of period at Mar. 31, 2021 | 1,291,093 | $ 493 | 1,218,323 | 811,921 | (130,767) | $ (608,877) |
Balance at beginning of period (shares) at Dec. 31, 2020 |  | 49,276 |  |  |  | 8,238 |
Balance at beginning of period at Dec. 31, 2020 | 1,283,815 | $ 493 | 1,221,788 | 789,303 | (118,432) | $ (609,337) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 95,538 |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2021 |  | 49,276 |  |  |  |  | 8,843
Balance at end of period at Sep. 30, 2021 | 1,293,820 | $ 493 | 1,222,432 | 849,438 | (125,761) |  | $ (652,782)
Balance at beginning of period (shares) at Mar. 31, 2021 |  | 49,276 |  |  |  | 8,249 |
Balance at beginning of period at Mar. 31, 2021 | 1,291,093 | $ 493 | 1,218,323 | 811,921 | (130,767) | $ (608,877) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based compensation expense | 1,625 |  | 1,625 |  |  |  |
Net income | 28,427 |  |  | 28,427 |  |  |
Cash dividends | (12,308) |  |  | (12,308) |  |  |
Currency translation adjustment | 14,977 |  |  |  | 14,977 |  |
Purchases of treasury stock (shares) |  |  |  |  |  | 452 |
Purchases of treasury stock | (32,998) |  |  |  |  | $ (32,998) |
Balance at end of period (shares) at Jun. 30, 2021 |  | 49,276 |  |  |  | 8,701 |
Balance at end of period at Jun. 30, 2021 | 1,290,816 | $ 493 | 1,219,948 | 828,040 | (115,790) | $ (641,875) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based compensation expense | 2,842 |  | 2,842 |  |  |  |
Net income | 33,396 |  |  | 33,396 |  |  |
Cash dividends | (11,998) |  |  | (11,998) |  |  |
Currency translation adjustment | (9,971) |  |  |  | (9,971) |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  | 152
Purchases of treasury stock | (11,645) |  |  |  |  |  | $ (11,645)
Balance at end of period (shares) at Sep. 30, 2021 |  | 49,276 |  |  |  |  | 8,843
Balance at end of period at Sep. 30, 2021 | 1,293,820 | $ 493 | 1,222,432 | 849,438 | (125,761) |  | $ (652,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  | (10)
Exercise of stock options | 380 |  | (358) |  |  |  | $ 738
Balance at beginning of period (shares) at Dec. 31, 2021 |  | 57,322 |  |  |  | 8,843 |
Balance at beginning of period at Dec. 31, 2021 | 1,808,127 | $ 573 | 1,724,956 | 866,679 | (131,299) | $ (652,782) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Shares issued under share-based compensation plan | 0 |  | (1,281) |  |  | $ 1,281 |
Shares issued under share-based compensation plan (shares) |  |  |  |  |  | (17) |
Share-based compensation expense | 3,075 |  | 3,075 |  |  |  |
Net income | 28,005 |  |  | 28,005 |  |  |
Cash dividends | (14,546) |  |  | (14,546) |  |  |
Currency translation adjustment | 11,789 |  |  |  | 11,789 |  |
Purchases of treasury stock (shares) |  |  |  |  |  | 1,048 |
Purchases of treasury stock | (72,217) |  |  |  |  | $ (72,217) |
Balance at end of period (shares) at Mar. 31, 2022 |  | 57,322 |  |  |  | 9,874 |
Balance at end of period at Mar. 31, 2022 | 1,764,233 | $ 573 | 1,726,750 | 880,138 | (119,510) | $ (723,718) |
Balance at beginning of period (shares) at Dec. 31, 2021 |  | 57,322 |  |  |  | 8,843 |
Balance at beginning of period at Dec. 31, 2021 | 1,808,127 | $ 573 | 1,724,956 | 866,679 | (131,299) | $ (652,782) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 173,429 |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2022 |  | 57,322 |  |  |  |  | 10,861
Balance at end of period at Sep. 30, 2022 | 1,805,155 | $ 573 | 1,732,500 | 995,669 | (127,366) |  | $ (796,221)
Balance at beginning of period (shares) at Mar. 31, 2022 |  | 57,322 |  |  |  | 9,874 |
Balance at beginning of period at Mar. 31, 2022 | 1,764,233 | $ 573 | 1,726,750 | 880,138 | (119,510) | $ (723,718) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based compensation expense | 2,875 |  | 2,875 |  |  |  |
Net income | 86,108 |  |  | 86,108 |  |  |
Cash dividends | (14,235) |  |  | (14,235) |  |  |
Currency translation adjustment | (484) |  |  |  | (484) |  |
Purchases of treasury stock (shares) |  |  |  |  |  | 301 |
Purchases of treasury stock | (20,499) |  |  |  |  | $ (20,499) |
Balance at end of period (shares) at Jun. 30, 2022 |  | 57,322 |  |  |  | 10,175 |
Balance at end of period at Jun. 30, 2022 | 1,817,998 | $ 573 | 1,729,625 | 952,011 | (119,994) | $ (744,217) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Share-based compensation expense | 2,875 |  | 2,875 |  |  |  |
Net income | 59,316 |  |  | 59,316 |  |  |
Cash dividends | (15,658) |  |  | (15,658) |  |  |
Currency translation adjustment | (7,372) |  |  |  | (7,372) |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  | 686
Purchases of treasury stock | (52,004) |  |  |  |  |  | $ (52,004)
Balance at end of period (shares) at Sep. 30, 2022 |  | 57,322 |  |  |  |  | 10,861
Balance at end of period at Sep. 30, 2022 | $ 1,805,155 | $ 573 | $ 1,732,500 | $ 995,669 | $ (127,366) |  | $ (796,221)

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