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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) | 1,535 |  |  | 1,535 |  |  |
Net income | 47,884 |  |  |  | 47,884 |  |
Dividends paid | (18,348) |  |  |  | (18,348) |  |
Currency translation adjustment | 36,342 |  |  |  |  | 36,342 |
Repurchases of treasury stock (shares) |  |  |  |  |  |  | 518
Repurchases of treasury stock (value) | (26,274) |  |  |  |  |  | $ (26,274)
Balance at end of period (shares) at Jun. 30, 2017 |  | 0 | 49,276 |  |  |  | 1,264
Balance at end of period (value) at Jun. 30, 2017 | 1,491,432 | $ 0 | $ 493 | 1,218,822 | 416,937 | (83,464) | $ (61,356)
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) | 2,750 |  |  | 2,750 |  |  |
Net income | 71,806 |  |  |  | 71,806 |  |
Dividends paid | (20,166) |  |  |  | (20,166) |  |
Currency translation adjustment | (2,791) |  |  |  |  | (2,791) |
Repurchases of treasury stock (shares) |  |  |  |  |  |  | 2,619
Repurchases of treasury stock (value) | (217,288) |  |  |  |  |  | $ (217,288)
Balance at end of period (shares) at Jun. 30, 2018 |  | 0 | 49,276 |  |  |  | 4,949
Balance at end of period (value) at Jun. 30, 2018 | $ 1,310,044 | $ 0 | $ 493 | $ 1,221,572 | $ 546,097 | $ (114,668) | $ (343,450)

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