CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock.	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2021	$ 6	$ 125,396	$ 3,292,923	$ 3,418,325
Balance (in shares) at Dec. 31, 2021	56,867
Changes in stockholders' equity
Net income			302,756	302,756
Stock based compensation		17,823		17,823
Stock based compensation (in shares)	817
Issuance of common stock in settlement of directors' fees		102		102
Issuance of common stock in settlement of directors' fees (in shares)	2
Common stock dividends			(22,564)	(22,564)
Repurchase of common stock	$ (1)	(143,321)	(111,735)	(255,057)
Repurchase of common stock (in shares)	(4,747)
Balance at Jun. 30, 2022	$ 5		3,461,380	3,461,385
Balance (in shares) at Jun. 30, 2022	52,939
Balance at Mar. 31, 2022	$ 6		3,441,597	3,441,603
Balance (in shares) at Mar. 31, 2022	55,342
Changes in stockholders' equity
Net income			129,163	129,163
Stock based compensation		15,352		15,352
Stock based compensation (in shares)	23
Issuance of common stock in settlement of directors' fees		51		51
Issuance of common stock in settlement of directors' fees (in shares)	1
Common stock dividends			(11,139)	(11,139)
Repurchase of common stock	$ (1)	(15,403)	(98,241)	(113,645)
Repurchase of common stock (in shares)	(2,427)
Balance at Jun. 30, 2022	$ 5		3,461,380	3,461,385
Balance (in shares) at Jun. 30, 2022	52,939
Balance at Dec. 31, 2022	$ 5		3,471,044	3,471,049
Balance (in shares) at Dec. 31, 2022	49,988
Changes in stockholders' equity
Net income			88,628	88,628
Stock based compensation		11,530		11,530
Stock based compensation (in shares)	1,069
Issuance of common stock in settlement of directors' fees		102		102
Issuance of common stock in settlement of directors' fees (in shares)	2
Common stock dividends			(20,974)	(20,974)
Repurchase of common stock		(11,632)	(59,943)	(71,575)
Repurchase of common stock (in shares)	(1,201)
Balance at Jun. 30, 2023	$ 5		3,478,755	3,478,760
Balance (in shares) at Jun. 30, 2023	49,858
Balance at Mar. 31, 2023	$ 5		3,452,185	3,452,190
Balance (in shares) at Mar. 31, 2023	50,097
Changes in stockholders' equity
Net income			58,250	58,250
Stock based compensation		4,680		4,680
Stock based compensation (in shares)	193
Issuance of common stock in settlement of directors' fees		51		51
Issuance of common stock in settlement of directors' fees (in shares)	1
Common stock dividends			(10,197)	(10,197)
Repurchase of common stock		$ (4,731)	(21,483)	(26,214)
Repurchase of common stock (in shares)	(433)
Balance at Jun. 30, 2023	$ 5		$ 3,478,755	$ 3,478,760
Balance (in shares) at Jun. 30, 2023	49,858