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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Preferred Stock | 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, 2016 |  | 0 | 49,276 |  |  |  | 769
Balance at beginning of period (value) at Dec. 31, 2016 | $ 1,449,986 | $ 0 | $ 493 | $ 1,217,969 | $ 387,401 | $ (119,806) | $ (36,071)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Shares issued under share-based compensation plan (shares) |  |  | 0 |  |  |  | (10)
Shares issued under share-based compensation plan (value) | 0 |  | $ 0 | (440) |  |  | $ 440
Exercise of stock options (shares) |  |  |  |  |  |  | (13)
Exercise of stock options (value) | 307 |  |  | (242) |  |  | $ 549
Share-based compensation expense (value) | 2,302 |  |  | 2,302 |  |  |
Net income | 76,158 |  |  |  | 76,158 |  |
Dividends paid | (27,400) |  |  |  | (27,400) |  |
Currency translation adjustment | 31,361 |  |  |  |  | 31,361 |
Repurchases of treasury stock (shares) |  |  |  |  |  |  | 1,182
Repurchases of treasury stock (value) | (65,035) |  |  |  |  |  | $ (65,035)
Balance at end of period (shares) at Sep. 30, 2017 |  | 0 | 49,276 |  |  |  | 1,928
Balance at end of period (value) at Sep. 30, 2017 | 1,467,679 | $ 0 | $ 493 | 1,219,589 | 436,159 | (88,445) | $ (100,117)
Balance at beginning of period (shares) at Dec. 31, 2017 |  | 0 | 49,276 |  |  |  | 2,362
Balance at beginning of period (value) at Dec. 31, 2017 | 1,475,333 | $ 0 | $ 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) |  |  | 0 |  |  |  | (22)
Shares issued under share-based compensation plan (value) | 0 |  | $ 0 | (1,240) |  |  | $ 1,240
Exercise of stock options (shares) |  |  | 0 |  |  |  | (10)
Exercise of stock options (value) | 400 |  | $ 0 | (294) |  |  | $ 694
Share-based compensation expense (value) | 4,125 |  |  | 4,125 |  |  |
Net income | 105,131 |  |  |  | 105,131 |  |
Dividends paid | (29,897) |  |  |  | (29,897) |  |
Currency translation adjustment | 13,907 |  |  |  |  | 13,907 |
Repurchases of treasury stock (shares) |  |  |  |  |  |  | 3,114
Repurchases of treasury stock (value) | (257,271) |  |  |  |  |  | $ (257,271)
Balance at end of period (shares) at Sep. 30, 2018 |  | 0 | 49,276 |  |  |  | 5,444
Balance at end of period (value) at Sep. 30, 2018 | $ 1,311,728 | $ 0 | $ 493 | $ 1,222,947 | $ 569,691 | $ (97,970) | $ (383,433)

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