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Unaudited Condensed Consolidated Statement of Equity Statement - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Capital in Excess of Par Value | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 | $ 1,409,437 | $ 191,936 | $ (5,321) | $ 970,468 | $ 210,364 | $ 41,943 | $ 47
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Comprehensive income | 244,772 | 0 | 0 | 0 | 254,162 | (9,547) | 157
Dividends declared on common stock | 93,002 | 0 | 0 | 0 | (93,002) | 0 | 0
Employee share-based compensation earned | 11,740 | 0 | 0 | 11,740 | 0 | 0 | 0
Stock option exercises | (18,481) | (1,340) | 0 | (17,141) | 0 | 0 | 0
Restricted stock awards, net of forfeitures | 0 | 178 | 0 | 178 | 0 | 0 | 0
Purchase of Company common stock | (275,726) | 0 | (7,302) | (38,159) | (230,265) | 0 | 0
Noncontrolling interest payments | 80 | 0 | 0 | 0 | 0 | 0 | 80
Other | 1,132 | 103 | 0 | 1,029 | 0 | 0 | 0
Balance at end of period at Sep. 30, 2018 | 1,488,986 | $ 193,557 | $ (12,623) | $ 962,041 | 313,720 | 32,167 | $ 124
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 172,232 |  |  |  | $ 172,461 | $ (229) |

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