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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 2,579,160 | $ 3 | $ 332,911 | $ (101) | $ 1,828,581 | $ 417,766
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 122,249 |  |  |  | 122,249 |
Other comprehensive income, net of tax | 200,893 |  |  |  |  | 200,893
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  |  |  |  | (120,135) | 120,135
Issuance of common stock | 4,490 |  | 4,490 |  |  |
Stock compensation expense | 23,439 |  | 23,439 |  |  |
Treasury Stock, Value, Acquired, Cost Method | (2,920) |  |  | (2,920) |  |
Stock Issued During Period, Value, Treasury Stock Reissued | 2,804 |  |  | 2,804 |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | 135 |  | 391 |  | (256) |
Balance at Dec. 31, 2017 | 2,930,250 | 3 | 361,231 | (217) | 1,830,439 | 738,794
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 365,614 |  |  |  | 365,614 |
Other comprehensive income, net of tax | (106,495) |  |  |  |  | (106,495)
Issuance of common stock | 5,271 |  | 5,271 |  |  |
Stock compensation expense | 27,840 |  | 27,840 |  |  |
Treasury Stock, Value, Acquired, Cost Method | (48,912) |  |  | (48,912) |  |
Balance at Dec. 31, 2018 | 4,020,331 | 3 | 394,342 | (49,129) | 3,722,073 | (46,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | 600 |  |  |  |  |
Net income | 1,758,675 |  |  |  | 1,758,675 |
Other comprehensive income, net of tax | (40,390) |  |  |  |  | (40,390)
Issuance of common stock | 5,017 |  | 5,017 |  |  |
Stock compensation expense | 35,593 |  | 35,593 |  |  |
Treasury Stock, Value, Acquired, Cost Method | (28,000) |  |  | (28,000) |  |
Stock Issued During Period, Value, Treasury Stock Reissued | 3,831 |  | (24,932) | 38,732 | (9,969) |
Balance at Dec. 31, 2019 | 5,755,057 | $ 3 | $ 410,020 | $ (38,397) | $ 5,470,779 | $ (87,348)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 300 |  |  |  |  |

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