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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Common Stock Outstanding [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | ---
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 | 0 | 0 | 0 | $ 2,528
Restricted stock units vested (in shares) | 224,995 |  |  |  |  |
Restricted stock units vested | $ 2 | 0 | 0 | 0 | 0 | 2
Warrants exercised (in shares) | 4,681 |  |  |  |  |
Warrants exercised | $ 0 | 0 | 0 | 0 | 0 | 0
Shares withheld related to net share settlement of RSUs | $ 0 | (6,813) | 0 | 0 | 0 | (6,813)
Stock issued to directors (in shares) | 15,400 |  |  |  |  |
Stock issued to directors | $ 0 | 550 | 0 | 0 | 0 | $ 550
Stock options exercised (in shares) | 46,790 |  |  |  |  | 46,790
Stock options exercised | $ 1 | 1,093 | 0 | 0 | 0 | $ 1,094
Equity consideration for acquisition (in shares) | 926,192 |  |  |  |  |
Equity consideration for acquisition | $ 9 | 34,853 | 0 | 0 | 0 | 34,862
Stock -based compensation | 0 | 5,184 | 0 | 0 | 0 | 5,184
Cash dividends | 0 | 0 | 0 | (69,888) | 0 | (69,888)
Change in other comprehensive loss | 0 | 0 | 1,204 | 0 | 0 | 1,204
Net income | $ 0 | 0 | 0 | 176,042 | 0 | 176,042
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 | 0 | 0 | 0 | $ 2,822
Restricted stock units vested (in shares) | 125,207 |  |  |  |  |
Restricted stock units vested | $ 1 | 0 | 0 | 0 | 0 | 1
Warrants exercised (in shares) | 476,064 |  |  |  |  |
Warrants exercised | $ 5 | (5) | 0 | 0 | 0 | 0
Shares withheld related to net share settlement of RSUs | $ 0 | (2,440) | 0 | 0 | 0 | (2,440)
Stock issued to directors (in shares) | 16,060 |  |  |  |  |
Stock issued to directors | $ 0 | 649 | 0 | 0 | 0 | $ 649
Stock options exercised (in shares) | 35,880 |  |  |  |  | 35,880
Stock options exercised | $ 0 | 838 | 0 | 0 | 0 | $ 838
Stock -based compensation | 0 | 7,325 | 0 | 0 | 0 | 7,325
Cash dividends | 0 | 0 | 0 | (83,446) | 0 | (83,446)
Change in other comprehensive loss | 0 | 0 | (6,424) | 0 | 0 | (6,424)
Net income | 0 | 0 | 0 | 271,885 | 0 | 271,885
Cumulative effect of changes in accounting principles | 0 | 0 | (8,556) | 8,556 | 0 | 0
Reclassification of tax effects in accumulated other comprehensive income resulting from the new corporate income tax rate | $ 0 | 0 | (515) | 515 | 0 | 0
Purchases of treasury stock (in shares) | (1,113,726) |  |  |  |  |
Purchases of treasury stock | $ 0 | 0 | 0 | 0 | (42,648) | (42,648)
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
Dividend Reinvestment Plan (in shares) | 93,143 |  |  |  |  | 93,143
Dividend Reinvestment Plan | $ 1 | 3,365 | 0 | 0 | 0 | $ 3,366
Restricted stock units vested (in shares) | 123,762 |  |  |  |  |
Restricted stock units vested | $ 1 | 0 | 0 | 0 | 0 | 1
Shares withheld related to net share settlement of RSUs | $ 0 | (2,311) | 0 | 0 | 0 | (2,311)
Stock issued to directors (in shares) | 21,160 |  |  |  |  |
Stock issued to directors | $ 0 | 749 | 0 | 0 | 0 | 749
Stock -based compensation | 0 | 6,601 | 0 | 0 | 0 | 6,601
Cash dividends | 0 | 0 | 0 | (99,131) | 0 | (99,131)
Change in other comprehensive loss | 0 | 0 | 20,308 | 0 | 0 | 20,308
Net income | $ 0 | 0 | 0 | 279,135 | 0 | 279,135
Purchases of treasury stock (in shares) | (1,010,594) |  |  |  |  |
Purchases of treasury stock | $ 0 | 0 | 0 | 0 | (36,301) | (36,301)
Balance (in shares) at Dec. 31, 2019 | 79,729,419 |  |  |  |  |
Balance at Dec. 31, 2019 | $ 900 | $ 950,466 | $ 2,302 | $ 1,659,153 | $ (318,538) | $ 2,294,283

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration