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Consolidated Statement of Equity - USD ($) $ in Thousands | Total | Adjustments for New Accounting Pronouncement | Common Stock | Common Stock Adjustments for New Accounting Pronouncement | Treasury Stock | Treasury Stock Adjustments for New Accounting Pronouncement | Capital in Excess of Par Value | Capital in Excess of Par Value Adjustments for New Accounting Pronouncement | Retained Earnings [Member] | Retained Earnings [Member] Adjustments for New Accounting Pronouncement | Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income Adjustments for New Accounting Pronouncement | Noncontrolling Interest | Noncontrolling Interest Adjustments for New Accounting Pronouncement
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2018 | $ 1,641,815 |  | $ 184,721 |  | $ (3,250) |  | $ 972,710 |  | $ 474,327 |  | $ 13,395 |  | $ (88) |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 86,614 |  | 0 |  | 0 |  | 0 |  | 79,323 |  | 7,251 |  | 40 |
Dividends, Common Stock | (32,820) |  | 0 |  | 0 |  | 0 |  | 32,820 |  | 0 |  | 0 |
Stock option exercises | 15,962 |  | 950 |  | 0 |  | 15,012 |  | 0 |  | 0 |  | 0 |
Restricted stock awards, net of forfeitures | 0 |  | 126 |  | 0 |  | (126) |  | 0 |  | 0 |  | 0 |
Employee share-based compensation earned | 4,568 |  | 0 |  | 0 |  | 4,568 |  | 0 |  | 0 |  | 0 |
Purchase of Company common stock | (14,542) |  | 0 |  | (355) |  | (1,935) |  | (12,252) |  | 0 |  | 0 |
Other | (1,192) |  | 59 |  | 0 |  | (1,251) |  | 0 |  | 0 |  | 0 |
Balance at end of period at Mar. 31, 2019 | 1,700,405 |  | 185,856 |  | (3,605) |  | 988,978 |  | 508,578 |  | 20,646 |  | (48) |
Balance at beginning of period at Dec. 31, 2018 | 1,641,815 |  | 184,721 |  | (3,250) |  | 972,710 |  | 474,327 |  | 13,395 |  | (88) |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 232,731 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 1,775,520 |  | 187,257 |  | (4,426) |  | 1,015,525 |  | 553,610 |  | 23,527 |  | 27 |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs | 15,537 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 1,700,405 |  | 185,856 |  | (3,605) |  | 988,978 |  | 508,578 |  | 20,646 |  | (48) |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 79,511 |  | 0 |  | 0 |  | 0 |  | 72,329 |  | 7,146 |  | 36 |
Dividends, Common Stock | (32,871) |  | 0 |  | 0 |  | 0 |  | (32,871) |  | 0 |  | 0 |
Stock option exercises | 7,139 |  | 513 |  | 0 |  | 6,626 |  | 0 |  | 0 |  | 0 |
Employee share-based compensation earned | 3,445 |  | 0 |  | 0 |  | 3,445 |  | 0 |  | 0 |  | 0 |
Purchase of Company common stock | (15,032) |  | 0 |  | (337) |  | (1,832) |  | (12,863) |  | 0 |  | 0 |
Other | 1,619 |  | 42 |  | 0 |  | 1,577 |  | 0 |  | 0 |  | 0 |
Balance at end of period at Jun. 30, 2019 | 1,744,216 |  | 186,411 |  | (3,942) |  | 998,794 |  | 535,173 |  | 27,792 |  | (12) |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 66,606 |  | 0 |  | 0 |  | 0 |  | 70,792 |  | (4,265) |  | 79 |
Dividends, Common Stock | $ (32,890) |  | 0 |  | 0 |  | 0 |  | (32,890) |  | 0 |  | 0 |
Dividends declared per share | $ 180 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option exercises | $ 16,730 |  | 844 |  | 0 |  | 15,886 |  | 0 |  | 0 |  | 0 |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (40) |  | 0 |  | 0 |  |  |  | 0 |  | 0 |  | (40) |
Employee share-based compensation earned | 3,550 |  | 0 |  | 0 |  | 3,550 |  | 0 |  | 0 |  | 0 |
Purchase of Company common stock | (22,609) |  | 0 |  | (484) |  | (2,660) |  | (19,465) |  | 0 |  | 0 |
Other | (43) |  | 2 |  | 0 |  | (45) |  | 0 |  | 0 |  | 0 |
Balance at end of period at Sep. 30, 2019 | 1,775,520 |  | 187,257 |  | (4,426) |  | 1,015,525 |  | 553,610 |  | 23,527 |  | 27 |
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 |
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) |  | $ 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 |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs | 14,501 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Dividends declared per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  | $ (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 |
Dividends declared per share | $ 190 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option exercises | $ 1,873 |  | 82 |  | 0 |  | 1,791 |  | 0 |  | 0 |  | 0 |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (60) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (60) |
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 |
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 |

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