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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
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2017 |  | 49,276 |  |  |  | 2,362
Balance at beginning of period (value) at Dec. 31, 2017 | $ 1,475,333 | $ 493 | $ 1,220,356 | $ 494,457 | $ (111,877) | $ (128,096)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued under share-based compensation plan (shares) |  |  |  |  |  | (22)
Shares issued under share-based compensation plan (value) | 0 |  | (1,240) |  |  | $ 1,240
Share-based compensation expense (value) | 1,375 |  | 1,375 |  |  |
Net income | 41,635 |  |  | 41,635 |  |
Cash dividends ($0.25 and $0.22 per share, respectively) | (10,245) |  |  | (10,245) |  |
Currency translation adjustment | 21,834 |  |  |  | 21,834 |
Repurchases of treasury stock (shares) |  |  |  |  |  | 1,378
Repurchases of treasury stock (value) | (105,646) |  |  |  |  | $ (105,646)
Balance at end of period (shares) at Mar. 31, 2018 |  | 49,276 |  |  |  | 3,718
Balance at end of period (value) at Mar. 31, 2018 | 1,424,286 | $ 493 | 1,220,491 | 525,847 | (90,043) | $ (232,502)
Balance at beginning of period (shares) at Dec. 31, 2017 |  | 49,276 |  |  |  | 2,362
Balance at beginning of period (value) at Dec. 31, 2017 | 1,475,333 | $ 493 | 1,220,356 | 494,457 | (111,877) | $ (128,096)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 71,806 |  |  |  |  |
Balance at end of period (shares) at Jun. 30, 2018 |  | 49,276 |  |  |  | 4,949
Balance at end of period (value) at Jun. 30, 2018 | 1,310,044 | $ 493 | 1,221,572 | 546,097 | (114,668) | $ (343,450)
Stock Issued During Period, Value, Stock Options Exercised | 400 |  | (294) |  |  | $ 694
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  | (10)
Balance at beginning of period (shares) at Mar. 31, 2018 |  | 49,276 |  |  |  | 3,718
Balance at beginning of period (value) at Mar. 31, 2018 | 1,424,286 | $ 493 | 1,220,491 | 525,847 | (90,043) | $ (232,502)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation expense (value) | 1,375 |  | 1,375 |  |  |
Net income | 30,171 |  |  | 30,171 |  |
Cash dividends ($0.25 and $0.22 per share, respectively) | (9,921) |  |  | (9,921) |  |
Currency translation adjustment | (24,625) |  |  |  | (24,625) |
Repurchases of treasury stock (shares) |  |  |  |  |  | 1,241
Repurchases of treasury stock (value) | (111,642) |  |  |  |  | $ (111,642)
Balance at end of period (shares) at Jun. 30, 2018 |  | 49,276 |  |  |  | 4,949
Balance at end of period (value) at Jun. 30, 2018 | 1,310,044 | $ 493 | 1,221,572 | 546,097 | (114,668) | $ (343,450)
Balance at beginning of period (shares) at Dec. 31, 2018 |  | 49,276 |  |  |  | 5,673
Balance at beginning of period (value) at Dec. 31, 2018 | 1,318,104 | $ 493 | 1,224,608 | 606,810 | (113,117) | $ (400,690)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued under share-based compensation plan (shares) |  |  |  |  |  | (21)
Shares issued under share-based compensation plan (value) | 0 |  | (1,441) |  |  | $ 1,441
Share-based compensation expense (value) | 2,315 |  | 2,315 |  |  |
Net income | 42,655 |  |  | 42,655 |  |
Cash dividends ($0.25 and $0.22 per share, respectively) | (10,891) |  |  | (10,891) |  |
Currency translation adjustment | 5,423 |  |  |  | 5,423 |
Repurchases of treasury stock (shares) |  |  |  |  |  | 343
Repurchases of treasury stock (value) | (29,190) |  |  |  |  | $ (29,190)
Balance at end of period (shares) at Mar. 31, 2019 |  | 49,276 |  |  |  | 5,995
Balance at end of period (value) at Mar. 31, 2019 | 1,328,416 | $ 493 | 1,225,482 | 638,574 | (107,694) | $ (428,439)
Balance at beginning of period (shares) at Dec. 31, 2018 |  | 49,276 |  |  |  | 5,673
Balance at beginning of period (value) at Dec. 31, 2018 | 1,318,104 | $ 493 | 1,224,608 | 606,810 | (113,117) | $ (400,690)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 75,703 |  |  |  |  |
Balance at end of period (shares) at Jun. 30, 2019 |  | 49,276 |  |  |  | 6,313
Balance at end of period (value) at Jun. 30, 2019 | 1,326,942 | $ 493 | 1,227,478 | 660,845 | (103,932) | $ (457,942)
Stock Issued During Period, Value, Stock Options Exercised | 400 |  | (319) |  |  | $ 719
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  | (10)
Balance at beginning of period (shares) at Mar. 31, 2019 |  | 49,276 |  |  |  | 5,995
Balance at beginning of period (value) at Mar. 31, 2019 | 1,328,416 | $ 493 | 1,225,482 | 638,574 | (107,694) | $ (428,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation expense (value) | 2,315 |  | 2,315 |  |  |
Net income | 33,048 |  |  | 33,048 |  |
Cash dividends ($0.25 and $0.22 per share, respectively) | (10,777) |  |  | (10,777) |  |
Currency translation adjustment | 3,762 |  |  |  | 3,762 |
Repurchases of treasury stock (shares) |  |  |  |  |  | 328
Repurchases of treasury stock (value) | (30,222) |  |  |  |  | $ (30,222)
Balance at end of period (shares) at Jun. 30, 2019 |  | 49,276 |  |  |  | 6,313
Balance at end of period (value) at Jun. 30, 2019 | $ 1,326,942 | $ 493 | $ 1,227,478 | $ 660,845 | $ (103,932) | $ (457,942)

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