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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, 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 | 305,452 |  |  |  |  |  |
Balance at end of period at Sep. 30, 2020 | 1,743,136 | 186,186 | (11,951) | 992,072 | 556,495 | 20,270 | 64
Balance at beginning 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] |  |  |  |  |  |  |
Comprehensive income | 119,291 | 0 | 0 | 0 | 105,508 | 13,736 | 47
Dividends, Common Stock | (33,719) | 0 | 0 | 0 | 33,719 | 0 | 0
Employee share-based compensation earned | 3,638 | 0 | 0 | 3,638 | 0 | 0 | 0
Purchase of Company common stock | (87,466) | 0 | (2,277) | (12,862) | (72,327) | 0 | 0
Other | 1,620 | 47 | 0 | 1,573 | 0 | 0 | 0
Balance at end of period at Jun. 30, 2020 | 1,754,328 | 186,105 | (9,094) | 1,002,988 | 561,882 | 12,400 | 47
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) | Accounting Standards Update 2016-13 [Member] | (129) | 0 | 0 | 0 | (129) | 0 | 0
Comprehensive income | 135,362 | 0 | 0 | 0 | 127,415 | 7,870 | 77
Dividends, Common Stock | (33,339) | 0 | 0 | 0 | 33,339 | 0 | 0
Stock option exercises | 1,873 | 82 | 0 | 1,791 | 0 | 0 | 0
Restricted stock awards, net of forfeitures | 0 | 2 | 0 | (2) | 0 | 0 | 0
Employee share-based compensation earned | 3,527 | 0 | 0 | 3,527 | 0 | 0 | 0
Purchase of Company common stock | (118,555) | 0 | (2,857) | (16,235) | (99,463) | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 60 | 0 | 0 | 0 | 0 | 0 | 60
Other | 0 | (3) | 0 | 3 | 0 | 0 | 0
Balance at end of period at Sep. 30, 2020 | 1,743,136 | 186,186 | (11,951) | 992,072 | 556,495 | 20,270 | 64
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 | 0 | 0 | 0 | 228,879 | 5,005 | 76
Dividends, Common Stock | $ (35,568) | 0 | 0 | 0 | (35,568) | 0 | 0
Dividends declared per share | $ 210 |  |  |  |  |  |
Stock option exercises | $ 2,364 | 99 | 0 | 2,265 | 0 | 0 | 0
Restricted stock awards, net of forfeitures | 0 | 163 | 0 | (163) | 0 | 0 | 0
Employee share-based compensation earned | 3,500 | 0 | 0 | 3,500 | 0 | 0 | 0
Purchase of Company common stock | $ (106,217) | $ 0 | $ (2,142) | $ (12,304) | $ (91,771) | $ 0 | $ 0
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)
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 | 597,281 |  |  |  |  |  |
Balance at end of period at Sep. 30, 2021 | 1,941,895 | 176,391 | (10,310) | 989,834 | 746,019 | 39,961 | 0
Balance at beginning of period at Mar. 31, 2021 | 1,850,660 | 175,051 | (6,214) | 975,232 | 662,271 | 44,371 | (51)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |
Comprehensive income | 164,723 | 0 | 0 | 0 | 157,705 | 6,934 | 84
Dividends, Common Stock | $ (35,352) | 0 | 0 | 0 | (35,352) | 0 | 0
Dividends declared per share |  |  |  |  |  |  |
Stock option exercises | $ 13,972 | 644 | 0 | 13,328 | 0 | 0 | 0
Restricted stock awards, net of forfeitures | 0 | (3) | 0 | 3 | 0 | 0 | 0
Employee share-based compensation earned | 3,596 | 0 | 0 | 3,596 | 0 | 0 | 0
Purchase of Company common stock | (81,048) | 0 | (1,542) | (8,955) | (70,551) | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 60 | 0 | 0 | 0 | 0 | 0 | 60
Other | 1,620 | 33 | 0 | 1,587 | 0 | 0 | 0
Balance at end of period at Jun. 30, 2021 | 1,918,111 | 175,725 | (7,756) | 984,791 | 714,073 | 51,305 | (27)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |
Comprehensive income | 198,598 | 0 | 0 | 0 | 209,855 | (11,344) | 87
Dividends, Common Stock | $ (38,365) | 0 | 0 | 0 | (38,365) | 0 | 0
Dividends declared per share | $ 230 |  |  |  |  |  |
Stock option exercises | $ 18,267 | 666 | 0 | 17,601 | 0 | 0 | 0
Employee share-based compensation earned | 3,534 | 0 | 0 | 3,534 | 0 | 0 | 0
Purchase of Company common stock | (157,190) | 0 | (2,554) | (15,092) | (139,544) | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 60 | 0 | 0 | 0 | 0 | 0 | 60
Other | (1,000) | 0 | 0 | (1,000) | 0 | 0 | 0
Balance at end of period at Sep. 30, 2021 | $ 1,941,895 | $ 176,391 | $ (10,310) | $ 989,834 | $ 746,019 | $ 39,961 | $ 0

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