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Consolidated Statement of Equity - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Capital in Excess of Par Value | Retained Earnings [Member] | Accumulated Other Comprehensive Income | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2019 | $ 1,823,255 | $ 185,101 | $ (3,916) | $ 1,010,361 | $ 601,903 | $ 29,864 | $ (58)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |
Comprehensive income | 50,799 | 0 | 0 | 0 | 81,941 | (31,200) | 58
Dividends, Common Stock | $ (34,414) | 0 | 0 | 0 | 34,414 | 0 | 0
Dividends declared per share | $ 190 |  |  |  |  |  |
Stock option exercises | $ 15,126 | 789 | 0 | 14,337 | 0 | 0 | 0
Restricted stock awards, net of forfeitures | 0 | 168 | 0 | (168) | 0 | 0 | 0
Employee share-based compensation earned | 3,406 | 0 | 0 | 3,406 | 0 | 0 | 0
Purchase of Company common stock | (123,102) | 0 | (2,901) | (16,202) | (103,999) | 0 | 0
Other | (1,095) | 0 | 0 | (1,095) | 0 | 0 | 0
Balance at end of period at Mar. 31, 2020 | 1,751,093 | 186,058 | (6,817) | 1,010,639 | 562,549 | (1,336) | 0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) | Accounting Standards Update 2016-13 [Member] | 17,118 | 0 | 0 | 0 | 17,118 | 0 | 0
Balance at beginning of period at Dec. 31, 2020 | 1,752,621 | $ 174,792 | $ (4,075) | $ 981,934 | $ 560,731 | $ 39,366 | $ (127)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |
Comprehensive income | $ 233,960 |  |  |  |  |  |
Dividends declared per share | $ 210 |  |  |  |  |  |
Treasury Stock, Shares, Retired | 0 | (3,000) | (3,000) | 0 | 0 | 0 | 0
Balance at end of period at Mar. 31, 2021 | $ 1,850,660 | $ 175,051 | $ (6,214) | $ 975,232 | $ 662,271 | $ 44,371 | $ (51)

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