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Unaudited Condensed Consolidated Statement of Equity Statement - 3 months ended Mar. 31, 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 | 72,456 | 0 | 0 | 0 | 81,988 | (9,589) | 57
Dividends declared on common stock | 31,348 | 0 | 0 | 0 | (31,348) | 0 | 0
Employee share-based compensation earned | 3,699 | 0 | 0 | 3,699 | 0 | 0 | 0
Stock option exercises | (4,989) | (282) | 0 | (4,707) | 0 | 0 | 0
Restricted stock awards, net of forfeitures | 0 | 163 | 0 | 163 | 0 | 0 | 0
Purchase of Company common stock | (118,797) | 0 | (3,095) | (16,101) | (99,601) | 0 | 0
Other | (819) | 47 | 0 | (866) | 0 | 0 | 0
Balance at end of period at Mar. 31, 2018 | 1,511,849 | $ 192,428 | $ (8,416) | $ 961,744 | 333,864 | 32,125 | $ 104
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 172,232 |  |  |  | $ 172,461 | $ (229) |

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