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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Shares | Noncontrolling Interests | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2019 | $ 9,858 | $ 389,446 | $ 2,736,481 | $ (275,850) | $ (2,041,763) | $ 905 | $ 819,077
Beginning Balance (in shares) at Dec. 31, 2019 | 60,592,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  | 55,562 |  |  | (7) | 55,555
Unrecognized amounts from defined benefit pension plans, net of tax |  |  |  | 609 |  |  | 609
Unrealized gain (loss) on derivatives designated and qualifying as cash flow hedges, net of tax |  |  |  | (2,369) |  |  | (2,369)
Currency translation adjustment |  |  |  | (70,567) |  | (41) | (70,608)
Cash dividends declared |  |  | (29,280) |  |  |  | (29,280)
Stock-based compensation activity |  | 2,826 |  |  | 1,912 |  | 4,738
Stock-based compensation activity (in shares) | 152,000 |  |  |  |  |  |
Purchase of shares for treasury |  |  |  |  | (109,762) |  | (109,762)
Purchase of shares for treasury (in shares) | (1,357,000) |  |  |  |  |  |
Other |  | (5,176) | 5,176 |  |  |  |
Ending Balance at Mar. 31, 2020 | $ 9,858 | 387,096 | 2,767,939 | (348,177) | (2,149,613) | 857 | 667,960
Ending Balance (in shares) at Mar. 31, 2020 | 59,387,000 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2020 | $ 9,858 | 409,958 | 2,821,359 | (302,190) | (2,149,714) | 979 | 790,250
Beginning Balance (in shares) at Dec. 31, 2020 | 59,641,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  | 74,177 |  |  | (44) | 74,133
Unrecognized amounts from defined benefit pension plans, net of tax |  |  |  | 5,060 |  |  | 5,060
Unrealized gain (loss) on derivatives designated and qualifying as cash flow hedges, net of tax |  |  |  | 7,290 |  |  | 7,290
Currency translation adjustment |  |  |  | (22,584) |  | (159) | (22,743)
Cash dividends declared |  |  | (30,572) |  |  |  | (30,572)
Stock-based compensation activity |  | 7,680 |  |  | 1,502 |  | 9,182
Stock-based compensation activity (in shares) | 134,000 |  |  |  |  |  |
Purchase of shares for treasury |  |  |  |  | (28,459) |  | $ (28,459)
Purchase of shares for treasury (in shares) | (237,000) |  |  |  |  |  | (200,000)
Other |  | 891 | (741) |  |  | (883) | $ (733)
Ending Balance at Mar. 31, 2021 | $ 9,858 | $ 418,529 | $ 2,864,223 | $ (312,424) | $ (2,176,671) | $ (107) | $ 803,408
Ending Balance (in shares) at Mar. 31, 2021 | 59,538,000 |  |  |  |  |  |

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