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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Retained Earnings | Accumulated Other Comprehensive Income/(Loss) | Common Stock Par Value | Treasury Stock | Capital in Excess of Par Value | Non-Controlling Interest | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 1,197,234 | $ (319,709) | $ 660 | $ (250,917) | $ 546,682 | $ 292 | $ 1,174,242
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net Income | 51,820 |  |  |  |  | (15) | 51,805
Foreign currency translation adjustments |  | 23,184 |  |  |  | 2 | 23,186
Changes in unrecognized pension gains/losses and related amortization, net of tax |  | 879 |  |  |  |  | 879
Changes in treasury locks, net of tax |  | 7 |  |  |  |  | 7
Stock awards and option exercises |  |  | 4 | 7,538 | 18,912 |  | 26,454
Cash dividends declared on common stock | (19,937) |  |  |  |  |  | (19,937)
Common stock repurchased and retired | (14,080) |  | (2) |  | (1,937) |  | (16,019)
Balance at Mar. 31, 2017 | 1,215,037 | (295,639) | 662 | (243,379) | 563,657 | 279 | 1,240,617
Balance at Dec. 31, 2017 | 1,301,147 | (253,302) | 667 | (346,245) | 609,471 | 310 | 1,312,048
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net Income | 59,300 |  |  |  |  | (12) | 59,288
Adoption of accounting standards | 2,937 |  |  |  |  |  | 2,937
Foreign currency translation adjustments |  | 22,924 |  |  |  | 11 | 22,935
Changes in unrecognized pension gains/losses and related amortization, net of tax |  | 1,356 |  |  |  |  | 1,356
Changes in treasury locks, net of tax |  | 7 |  |  |  |  | 7
Changes in derivative gains/losses, net of tax |  | 346 |  |  |  |  | 346
Stock awards and option exercises |  |  | 5 | 12,174 | 30,212 |  | 42,391
Cash dividends declared on common stock | (19,830) |  |  |  |  |  | (19,830)
Treasury stock purchased |  |  |  | (3,905) |  |  | (3,905)
Common stock repurchased and retired | (11,336) |  | (1) |  | (1,460) |  | (12,797)
Balance at Mar. 31, 2018 | $ 1,332,218 | $ (228,669) | $ 671 | $ (337,976) | $ 638,223 | $ 309 | $ 1,404,776

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