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Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Paid-in Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 |  | $ 1,751 | $ 289,422 | $ 2,141,302 | $ (665) | $ (259,742) | $ (1,149,411)
Beginning balance (in shares) at Dec. 31, 2019 |  | 110,780 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net issuance of treasury stock for vested restricted stock units (in shares) |  | 365 |  |  |  |  |
Repurchases of common stock (in shares) |  | (259) |  |  |  |  |
Stock compensation expense |  |  | 13,880 |  |  |  |
Net issuance of treasury stock for vested restricted stock units |  |  | (1,839) |  |  |  | (4,382)
Net income | $ 248,623 |  |  | 248,623 |  |  |
Dividends declared on common stock |  |  |  | (40,532) |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Other comprehensive (loss) income |  |  |  |  |  | (12,610) |
Repurchases of common stock |  |  |  |  |  |  | (6,934)
Ending balance at Sep. 30, 2020 | $ 1,218,863 | $ 1,751 | 301,463 | 2,348,728 |  | (272,352) | (1,160,727)
Ending balance (in shares) at Sep. 30, 2020 |  | 110,886 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Dividends declared on common stock per share (usd per share) | $ 0.36 |  |  |  |  |  |
Beginning balance at Jun. 30, 2020 |  | $ 1,751 | 296,639 | 2,249,391 |  | (297,360) | (1,160,727)
Beginning balance (in shares) at Jun. 30, 2020 |  | 110,886 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net issuance of treasury stock for vested restricted stock units (in shares) |  | 0 |  |  |  |  |
Repurchases of common stock (in shares) |  | 0 |  |  |  |  |
Stock compensation expense |  |  | 4,824 |  |  |  |
Net issuance of treasury stock for vested restricted stock units |  |  | 0 |  |  |  | 0
Net income | $ 112,851 |  |  | 112,851 |  |  |
Dividends declared on common stock |  |  |  | (13,514) |  |  |
Other comprehensive (loss) income |  |  |  |  |  | 25,008 |
Repurchases of common stock |  |  |  |  |  |  | 0
Ending balance at Sep. 30, 2020 | $ 1,218,863 | $ 1,751 | 301,463 | 2,348,728 |  | (272,352) | (1,160,727)
Ending balance (in shares) at Sep. 30, 2020 |  | 110,886 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Dividends declared on common stock per share (usd per share) | $ 0.12 |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 1,252,873 | $ 1,751 | 306,363 | 2,395,395 |  | (260,953) | (1,189,683)
Beginning balance (in shares) at Dec. 31, 2020 |  | 110,057 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net issuance of treasury stock for vested restricted stock units (in shares) |  | 353 |  |  |  |  |
Repurchases of common stock (in shares) |  | 0 |  |  |  |  |
Stock compensation expense |  |  | 15,605 |  |  |  |
Net issuance of treasury stock for vested restricted stock units |  |  | (1,836) |  |  |  | (6,737)
Net income | 274,049 |  |  | 274,049 |  |  |
Dividends declared on common stock |  |  |  | (47,043) |  |  |
Other comprehensive (loss) income |  |  |  |  |  | (30,205) |
Repurchases of common stock |  |  |  |  |  |  | 0
Ending balance at Sep. 30, 2021 | $ 1,456,706 | $ 1,751 | 320,132 | 2,622,401 |  | (291,158) | (1,196,420)
Ending balance (in shares) at Sep. 30, 2021 |  | 110,410 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Dividends declared on common stock per share (usd per share) | $ 0.42 |  |  |  |  |  |
Beginning balance at Jun. 30, 2021 |  | $ 1,751 | 314,873 | 2,531,783 |  | (263,433) | (1,196,394)
Beginning balance (in shares) at Jun. 30, 2021 |  | 110,408 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net issuance of treasury stock for vested restricted stock units (in shares) |  | 2 |  |  |  |  |
Repurchases of common stock (in shares) |  | 0 |  |  |  |  |
Stock compensation expense |  |  | 5,268 |  |  |  |
Net issuance of treasury stock for vested restricted stock units |  |  | (9) |  |  |  | (26)
Net income | $ 106,292 |  |  | 106,292 |  |  |
Dividends declared on common stock |  |  |  | (15,674) |  |  |
Other comprehensive (loss) income |  |  |  |  |  | (27,725) |
Repurchases of common stock |  |  |  |  |  |  | 0
Ending balance at Sep. 30, 2021 | $ 1,456,706 | $ 1,751 | $ 320,132 | $ 2,622,401 |  | $ (291,158) | $ (1,196,420)
Ending balance (in shares) at Sep. 30, 2021 |  | 110,410 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Dividends declared on common stock per share (usd per share) | $ 0.14 |  |  |  |  |  |

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