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			173,593	173,593
Stock based compensation		2,471		2,471
Stock based compensation (in shares)	794
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			(11,425)	(11,425)
Repurchase of common stock		(127,918)	(13,494)	(141,412)
Repurchase of common stock (in shares)	(2,320)
Balance at Mar. 31, 2022	$ 6		3,441,597	3,441,603
Balance (in shares) at Mar. 31, 2022	55,342
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			30,378	30,378
Stock based compensation		6,850		6,850
Stock based compensation (in shares)	876
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			(10,777)	(10,777)
Repurchase of common stock		$ (6,901)	(38,460)	(45,361)
Repurchase of common stock (in shares)	(768)
Balance at Mar. 31, 2023	$ 5		$ 3,452,185	$ 3,452,190
Balance (in shares) at Mar. 31, 2023	50,097