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v3.10.0.1

Consolidated Statement of Shareholders' Investment - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance (in shares) |  | 280,281,321 |  |  | 280,281,321 |  |
Beginning balance |  | $ 2,049,518,261 |  | $ 1,910,424,234 | $ 2,049,518,261 | $ 1,910,424,234 | $ 1,722,516,761
Issuance of common stock |  |  |  |  | 66,837,820 | 47,770,467 | 86,893,439
Repurchases of common stock |  |  |  |  | (591,577,851) | (231,363,216) | (163,361,221)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock |  |  |  |  | 18,305,981 | 18,376,965 | 19,192,699
Dividends declared |  |  |  |  | (117,064,654) | (110,946,799) | (102,268,251)
Net income | $ 106,275,000 | $ 111,249,000 | $ 130,469,000 | $ 97,557,000 | 437,883,097 | 406,791,922 | 347,591,276
Other comprehensive income |  |  |  |  | $ (2,150,994) | $ 8,464,688 | (140,469)
Ending balance (in shares) | 259,328,613 |  | 280,281,321 |  | 259,328,613 | 280,281,321 |
Ending balance | $ 1,861,751,660 |  | $ 2,049,518,261 |  | $ 1,861,751,660 | $ 2,049,518,261 | $ 1,910,424,234
Common Stocks |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance (in shares) |  | 280,281,321 |  | 287,737,516 | 280,281,321 | 287,737,516 | 291,338,011
Beginning balance |  | $ 16,816,879 |  | $ 17,264,251 | $ 16,816,879 | $ 17,264,251 | $ 17,480,281
Issuance of common stock (in shares) |  |  |  |  | 5,496,659 | 4,498,729 | 6,705,632
Issuance of common stock |  |  |  |  | $ 329,801 | $ 269,923 | $ 402,338
Repurchases of common stock (in shares) |  |  |  |  | (26,449,367) | (11,954,924) | (10,306,127)
Repurchases of common stock |  |  |  |  | $ (1,586,963) | $ (717,295) | $ (618,368)
Ending balance (in shares) | 259,328,613 |  | 280,281,321 |  | 259,328,613 | 280,281,321 | 287,737,516
Ending balance | $ 15,559,717 |  | $ 16,816,879 |  | $ 15,559,717 | $ 16,816,879 | $ 17,264,251
Additional Paid-In Capital |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 723,510,672 |  | 683,446,463 | 723,510,672 | 683,446,463 | 596,782,695
Issuance of common stock |  |  |  |  | 66,508,019 | 47,500,544 | 86,491,101
Repurchases of common stock |  |  |  |  | (63,000,528) | (25,813,300) | (19,020,032)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock |  |  |  |  | 18,305,981 | 18,376,965 | 19,192,699
Ending balance | 745,324,144 |  | 723,510,672 |  | 745,324,144 | 723,510,672 | 683,446,463
Retained Earnings |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 1,301,997,327 |  | 1,210,984,825 | 1,301,997,327 | 1,210,984,825 | 1,109,384,621
Repurchases of common stock |  |  |  |  | (526,990,360) | (204,832,621) | (143,722,821)
Impact of ASU 2016-01 adoption |  |  |  |  | 6,642,727 |  |
Dividends declared |  |  |  |  | (117,064,654) | (110,946,799) | (102,268,251)
Net income |  |  |  |  | 437,883,097 | 406,791,922 | 347,591,276
Ending balance | 1,102,468,137 |  | 1,301,997,327 |  | 1,102,468,137 | 1,301,997,327 | 1,210,984,825
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | $ 7,193,383 |  | $ (1,271,305) | 7,193,383 | (1,271,305) | (1,130,836)
Impact of ASU 2016-01 adoption |  |  |  |  | (6,642,727) |  |
Other comprehensive income |  |  |  |  | (2,150,994) | 8,464,688 | (140,469)
Ending balance | $ (1,600,338) |  | $ 7,193,383 |  | $ (1,600,338) | $ 7,193,383 | $ (1,271,305)

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