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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2015 | 80,806,116 |  |  |  |  |
Balance at Dec. 31, 2015 | $ 870 | $ 880,822 | $ (8,426) | $ 1,059,660 | $ (185,148) | $ 1,747,778
Dividend Reinvestment Plan (in shares) | 72,231 |  |  |  |  | 72,231
Dividend Reinvestment Plan | $ 1 | 2,276 |  |  |  | $ 2,277
Restricted stock units vested (in shares) | 10,325 |  |  |  |  |
Restricted stock units vested |  |  |  |  |  |
Warrant exercised (in shares) | 388,001 |  |  |  |  |
Warrant exercised | $ 4 | (4) |  |  |  |
Shares withheld related to net share settlement of RSUs |  | (103) |  |  |  | (103)
Stock issued to directors (in shares) | 19,602 |  |  |  |  |
Stock issued to directors |  | 550 |  |  |  | $ 550
Stock options exercised (in shares) | 327,830 |  |  |  |  | 327,830
Stock options exercised | $ 3 | 7,658 |  |  |  | $ 7,661
Purchases of treasury stock (in shares) | (2,013,828) |  |  |  |  |
Purchases of treasury stock |  |  |  |  | (54,441) | (54,441)
Tax short-fall from stock options |  | (132) |  |  |  | (132)
Stock -based compensation |  | 4,413 |  |  |  | 4,413
Cash dividends |  |  |  | (59,274) |  | (59,274)
Change in other comprehensive loss |  |  | 4,711 |  |  | 4,711
Net income |  |  |  | 175,099 |  | 175,099
Balance (in shares) at Dec. 31, 2016 | 79,610,277 |  |  |  |  |
Balance at Dec. 31, 2016 | $ 878 | 895,480 | (3,715) | 1,175,485 | (239,589) | $ 1,828,539
Dividend Reinvestment Plan (in shares) | 65,044 |  |  |  |  | 65,044
Dividend Reinvestment Plan | $ 1 | 2,527 |  |  |  | $ 2,528
Restricted stock units vested (in shares) | 224,995 |  |  |  |  |
Restricted stock units vested | $ 2 |  |  |  |  | 2
Warrant exercised (in shares) | 4,681 |  |  |  |  |
Warrant exercised |  |  |  |  |  |
Shares withheld related to net share settlement of RSUs |  | (6,813) |  |  |  | (6,813)
Stock issued to directors (in shares) | 15,400 |  |  |  |  |
Stock issued to directors |  | 550 |  |  |  | $ 550
Stock options exercised (in shares) | 46,790 |  |  |  |  | 46,790
Stock options exercised | $ 1 | 1,093 |  |  |  | $ 1,094
Stock -based compensation |  | 5,184 |  |  |  | 5,184
Cash dividends |  |  |  | (69,888) |  | (69,888)
Change in other comprehensive loss |  |  | 1,204 |  |  | 1,204
Net income |  |  |  | 176,042 |  | 176,042
Equity consideration for acquisition (in shares) | 926,192 |  |  |  |  |
Equity consideration for acquisition | $ 9 | 34,853 |  |  |  | 34,862
Balance (in shares) at Dec. 31, 2017 | 80,893,379 |  |  |  |  |
Balance at Dec. 31, 2017 | $ 891 | 932,874 | (2,511) | 1,281,639 | (239,589) | $ 1,973,304
Dividend Reinvestment Plan (in shares) | 69,084 |  |  |  |  | 69,084
Dividend Reinvestment Plan | $ 1 | 2,821 |  |  |  | $ 2,822
Restricted stock units vested (in shares) | 125,207 |  |  |  |  |
Restricted stock units vested | $ 1 |  |  |  |  | 1
Warrant exercised (in shares) | 476,064 |  |  |  |  |
Warrant exercised | $ 5 | (5) |  |  |  |
Shares withheld related to net share settlement of RSUs |  | (2,440) |  |  |  | (2,440)
Stock issued to directors (in shares) | 16,060 |  |  |  |  |
Stock issued to directors |  | 649 |  |  |  | $ 649
Stock options exercised (in shares) | 35,880 |  |  |  |  | 35,880
Stock options exercised |  | 838 |  |  |  | $ 838
Purchases of treasury stock (in shares) | (1,113,726) |  |  |  |  |
Purchases of treasury stock |  |  |  |  | (42,648) | (42,648)
Stock -based compensation |  | 7,325 |  |  |  | 7,325
Cash dividends |  |  |  | (83,446) |  | (83,446)
Change in other comprehensive loss |  |  | (6,424) |  |  | (6,424)
Net income |  |  |  | 271,885 |  | 271,885
Cumulative effect of changes in accounting principles |  |  | (8,556) | 8,556 |  |
Reclassification of tax effects in accumulated other comprehensive income resulting from the new corporate income tax rate |  |  | (515) | 515 |  |
Balance (in shares) at Dec. 31, 2018 | 80,501,948 |  |  |  |  |
Balance at Dec. 31, 2018 | $ 898 | $ 942,062 | $ (18,006) | $ 1,479,149 | $ (282,237) | $ 2,121,866

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