CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Series B Preferred Stock	Preferred Stock Shares	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Series B Preferred Stock
Beginning Balance, issued (in shares) at Dec. 31, 2020			2,510,696	456,729,251
Beginning Balance (in shares) at Dec. 31, 2020				375,287,999	81,441,252
Beginning Balance at Dec. 31, 2020	$ 2,562,835		$ 251,070	$ 91,346	$ (798,993)	$ 1,331,247	$ (34,200)	$ 1,722,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	781,408							781,408
Other comprehensive income (loss), net of tax	12,560						12,560
Total comprehensive income	793,968
Cash dividends declared:
Common Stock	(20,170)							(20,170)
Preferred Stock		$ (2,393)							$ (2,393)
Dividend equivalent units related to employee stock-based compensation plans	$ (16)					522		(538)
Issuance of common shares (in shares)	3,281,307			3,281,307
Issuance of common shares	$ 2,021			$ 656		1,365
Stock-based compensation expense	17,568					17,568
Common stock repurchased and cancelled (in shares)				(28,502,460)
Common stock repurchased and cancelled	$ (472,388)			$ (5,700)		(466,688)
Common stock repurchased (in shares)	(71,509,671)			(43,007,211)	(43,007,211)
Common stock repurchased	$ (560,117)				$ (734,801)	174,684
Shares repurchased related to employee stock-based compensation plans (in shares)	(1,252,412)			(1,252,412)	(1,252,412)
Shares repurchased related to employee stock-based compensation plans	$ (17,930)				$ (17,930)
Ending Balance, issued (in shares) at Jun. 30, 2021			2,510,696	431,508,098
Ending Balance (in shares) at Jun. 30, 2021				305,807,223	125,700,875
Ending Balance at Jun. 30, 2021	2,303,378		$ 251,070	$ 86,302	$ (1,551,724)	1,058,698	(21,640)	2,480,672
Beginning Balance, issued (in shares) at Mar. 31, 2021			2,510,696	431,053,178
Beginning Balance (in shares) at Mar. 31, 2021				328,351,576	102,701,602
Beginning Balance at Mar. 31, 2021	2,608,464		$ 251,070	$ 86,211	$ (1,108,630)	1,052,904	(24,077)	2,350,986
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	140,201							140,201
Other comprehensive income (loss), net of tax	2,437						2,437
Total comprehensive income	142,638
Cash dividends declared:
Common Stock	(9,264)							(9,264)
Preferred Stock		(1,192)							(1,192)
Dividend equivalent units related to employee stock-based compensation plans	$ 0					59		(59)
Issuance of common shares (in shares)	454,920			454,920
Issuance of common shares	$ (40)			$ 91		(131)
Stock-based compensation expense	6,444					6,444
Fees related to first-quarter 2021 common stock tender offer	$ (578)					(578)
Common stock repurchased (in shares)	(22,806,841)			(22,806,841)	(22,806,841)
Common stock repurchased	$ (439,477)				$ (439,477)	0
Shares repurchased related to employee stock-based compensation plans (in shares)	(192,432)			(192,432)	(192,432)
Shares repurchased related to employee stock-based compensation plans	$ (3,617)				$ (3,617)
Ending Balance, issued (in shares) at Jun. 30, 2021			2,510,696	431,508,098
Ending Balance (in shares) at Jun. 30, 2021				305,807,223	125,700,875
Ending Balance at Jun. 30, 2021	2,303,378		$ 251,070	$ 86,302	$ (1,551,724)	1,058,698	(21,640)	2,480,672
Beginning Balance, issued (in shares) at Dec. 31, 2021			2,510,696	432,013,372
Beginning Balance (in shares) at Dec. 31, 2021				278,956,733	153,056,639
Beginning Balance at Dec. 31, 2021	2,149,711		$ 251,070	$ 86,403	$ (2,061,383)	1,074,384	(17,897)	2,817,134
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	470,885							470,885
Other comprehensive income (loss), net of tax	(46,102)						(46,102)
Total comprehensive income	424,783
Cash dividends declared:
Common Stock	(58,576)							(58,576)
Preferred Stock		(3,032)							(3,032)
Dividend equivalent units related to employee stock-based compensation plans	$ (17)					784		(801)
Issuance of common shares (in shares)	3,088,710			3,088,710
Issuance of common shares	$ 450			$ 618		(168)
Stock-based compensation expense	$ 20,296					20,296
Common stock repurchased (in shares)	(29,530,400)			(29,530,400)	(29,530,400)
Common stock repurchased	$ (536,038)				$ (536,038)
Shares repurchased related to employee stock-based compensation plans (in shares)	(1,130,903)			(1,130,903)	(1,130,903)
Shares repurchased related to employee stock-based compensation plans	$ (20,767)				$ (20,767)
Ending Balance, issued (in shares) at Jun. 30, 2022			2,510,696	435,102,082
Ending Balance (in shares) at Jun. 30, 2022				251,384,140	183,717,942
Ending Balance at Jun. 30, 2022	1,976,810		$ 251,070	$ 87,021	$ (2,618,188)	1,095,296	(63,999)	3,225,610
Beginning Balance, issued (in shares) at Mar. 31, 2022			2,510,696	434,608,189
Beginning Balance (in shares) at Mar. 31, 2022				271,083,556	163,524,633
Beginning Balance at Mar. 31, 2022	2,044,207		$ 251,070	$ 86,922	$ (2,254,667)	1,086,852	(39,514)	2,913,544
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	342,073							342,073
Other comprehensive income (loss), net of tax	(24,485)						(24,485)
Total comprehensive income	317,588
Cash dividends declared:
Common Stock	(28,083)							(28,083)
Preferred Stock		$ (1,757)							$ (1,757)
Dividend equivalent units related to employee stock-based compensation plans	$ (1)					166		(167)
Issuance of common shares (in shares)	493,893			493,893
Issuance of common shares	$ 2			$ 99		(97)
Stock-based compensation expense	$ 8,375					8,375
Common stock repurchased (in shares)	(19,997,008)			(19,997,008)	(19,997,008)
Common stock repurchased	$ (360,095)				$ (360,095)
Shares repurchased related to employee stock-based compensation plans (in shares)	(196,301)			(196,301)	(196,301)
Shares repurchased related to employee stock-based compensation plans	$ (3,426)				$ (3,426)
Ending Balance, issued (in shares) at Jun. 30, 2022			2,510,696	435,102,082
Ending Balance (in shares) at Jun. 30, 2022				251,384,140	183,717,942
Ending Balance at Jun. 30, 2022	$ 1,976,810		$ 251,070	$ 87,021	$ (2,618,188)	$ 1,095,296	$ (63,999)	$ 3,225,610