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Unaudited Condensed Consolidated Statements of Shareholders' Investment - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | $ 1,938,087,820 | [1] | $ 1,861,751,660
Issuance of common stock from stock plan transactions | $ 7,355,488 |  | 10,514,554
Repurchases of common stock (in shares) | (7,000,000.0) |  |
Repurchases of common stock | $ (178,819,584) |  | (96,267,228)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock | 6,356,070 |  | 4,862,947
Dividends declared | (29,383,859) |  | (29,392,200)
Net Income | 89,505,801 |  | 104,280,411
Other comprehensive loss | 1,503,897 |  | 1,324,604
Balance at end of period | $ 1,834,605,633 |  | $ 1,857,074,748
Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance (in shares) | 251,277,515 |  | 259,328,613
Balance at beginning of period | $ 15,076,651 |  | $ 15,559,717
Issuance of common stock from stock plan transactions (in shares) | 607,175 |  | 980,670
Issuance of common stock from stock plan transactions | $ 36,431 |  | $ 58,840
Repurchases of common stock (in shares) | (7,019,032) |  | (4,724,938)
Repurchases of common stock | $ (421,143) |  | $ (283,496)
Ending balance (in shares) | 244,865,658 |  | 255,584,345
Balance at end of period | $ 14,691,939 |  | $ 15,335,061
Additional Paid-In Capital |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | 807,928,139 |  | 745,324,144
Issuance of common stock from stock plan transactions | 7,319,057 |  | 10,455,714
Repurchases of common stock | (20,214,812) |  | (12,001,344)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock | 6,356,070 |  | 4,862,947
Balance at end of period | 801,388,454 |  | 748,641,461
Retained Earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | 1,116,372,133 |  | 1,102,468,137
Repurchases of common stock | (158,183,629) |  | (83,982,388)
Dividends declared | (29,383,859) |  | (29,392,200)
Net Income | 89,505,801 |  | 104,280,411
Balance at end of period | 1,018,310,446 |  | 1,093,373,960
Accumulated Other Comprehensive Income (Loss) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | (1,289,103) |  | (1,600,338)
Other comprehensive loss | 1,503,897 |  | 1,324,604
Balance at end of period | $ 214,794 |  | $ (275,734)
[1] | The condensed consolidated balance sheet at December 31, 2019 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

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