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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Shares | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 1,285,781 | $ 9,858 | $ 258,816 | $ 2,086,174 | $ (288,622) | $ (783,677) | $ 3,232
Beginning Balance (in shares) at Dec. 31, 2014 |  | 76,997,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | 127,412 |  |  | 127,478 |  |  | (66)
Unrecognized amounts from defined benefit pension plans, net of tax | 98,117 |  |  |  | 98,117 |  |
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax | 557 |  |  |  | 557 |  |
Currency translation adjustment | (106,935) |  |  |  | (106,312) |  | (623)
Cash dividends declared - $1.44, $1.31, and $1.19 per share during the year 2017, 2016 and 2015, respectively | (87,814) |  |  | (87,814) |  |  |
Stock-based compensation activity | 16,513 |  | 14,092 |  |  | 2,421 |
Issuance of shares under benefit plans (in shares) |  | 274,000 |  |  |  |  |
Purchase of shares for treasury | (399,494) |  |  |  |  | (399,494) |
Purchase of shares for treasury (in shares) |  | (6,578,000) |  |  |  |  |
Equity (Increase) Decrease from Transactions with Noncontrolling Interest Holders | (1,689) |  |  |  | (7) |  | (1,682)
Ending Balance at Dec. 31, 2015 | 932,448 | $ 9,858 | 272,908 | 2,125,838 | (296,267) | (1,180,750) | 861
Ending Balance (in shares) at Dec. 31, 2015 |  | 70,693,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | 198,373 |  |  | 198,399 |  |  | (26)
Unrecognized amounts from defined benefit pension plans, net of tax | 3,837 |  |  |  | 3,837 |  |
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax | 39 |  |  |  | 39 |  |
Currency translation adjustment | (36,752) |  |  |  | (36,646) |  | (106)
Cash dividends declared - $1.44, $1.31, and $1.19 per share during the year 2017, 2016 and 2015, respectively | (88,166) |  |  | (88,166) |  |  |
Stock-based compensation activity | 44,430 |  | 36,509 |  |  | 7,921 |
Issuance of shares under benefit plans (in shares) |  | 843,000 |  |  |  |  |
Purchase of shares for treasury | (342,003) |  |  |  |  | (342,003) |
Purchase of shares for treasury (in shares) |  | (5,862,000) |  |  |  |  |
Ending Balance at Dec. 31, 2016 | $ 712,206 | $ 9,858 | 309,417 | 2,236,071 | (329,037) | (1,514,832) | 729
Ending Balance (in shares) at Dec. 31, 2016 | 65,674,754 | 65,674,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | $ 247,475 |  |  | 247,503 |  |  | (28)
Unrecognized amounts from defined benefit pension plans, net of tax | 10,662 |  |  |  | 10,662 |  |
Unrealized gain on derivatives designated and qualifying as cash flow hedges, net of tax | 288 |  |  |  | 288 |  |
Currency translation adjustment | 71,016 |  |  |  | 70,901 |  | 115
Cash dividends declared - $1.44, $1.31, and $1.19 per share during the year 2017, 2016 and 2015, respectively | (95,355) |  |  | (95,355) |  |  |
Stock-based compensation activity | 29,325 |  | 24,892 |  |  | 4,433 |
Issuance of shares under benefit plans (in shares) |  | 470,000 |  |  |  |  |
Purchase of shares for treasury | $ (43,164) |  |  |  |  | (43,164) |
Purchase of shares for treasury (in shares) | (459,901) | (481,000) |  |  |  |  |
Ending Balance at Dec. 31, 2017 | $ 932,453 | $ 9,858 | $ 334,309 | $ 2,388,219 | $ (247,186) | $ (1,553,563) | $ 816
Ending Balance (in shares) at Dec. 31, 2017 | 65,662,546 | 65,663,000 |  |  |  |  |

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