CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Series B Preferred Stock	Cumulative Effect, Period Of Adoption, Adjustment	Cumulative Effect, Period Of Adoption, Adjusted Balance	Preferred Stock Shares	Preferred Stock Shares Cumulative Effect, Period Of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period Of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period Of Adoption, Adjusted Balance	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period Of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period Of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Series B Preferred Stock	Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period Of Adoption, Adjusted Balance
Beginning Balance, issued (in shares) at Dec. 31, 2019					4,000,000	4,000,000	453,599,926	453,599,926
Beginning Balance (in shares) at Dec. 31, 2019							421,093,364	421,093,364	(32,506,562)	(32,506,562)
Beginning Balance at Dec. 31, 2019	$ 3,311,836		$ (952,639)	$ 2,359,197	$ 400,000	$ 400,000	$ 90,720	$ 90,720	$ (324,659)	$ (324,659)	$ 1,307,630	$ 1,307,630	$ (12,367)	$ (12,367)	$ 1,850,512		$ (952,639)	$ 897,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	447,990														447,990
Other comprehensive income, net of tax	(26,574)												(26,574)
Total comprehensive income	421,416
Dividends, Cash [Abstract]
Common Stock	(35,097)														(35,097)
Preferred Stock		$ (8,000)														$ (8,000)
Dividend equivalent units related to employee stock-based compensation plans	$ (10)										270				(280)
Issuance of common shares (in shares)	2,990,447						2,990,447
Issuance of common shares	$ 2,897						$ 599				2,298
Stock-based compensation expense	$ 30,375										30,207				168
Common stock repurchased (in shares)	(47,736,847)						(47,736,847)		(47,736,847)
Common stock repurchased	$ (558,167)								$ (461,244)		(96,923)
Shares repurchased related to employee stock-based compensation plans (in shares)	(1,109,149)						(1,109,149)		(1,109,149)
Shares repurchased related to employee stock-based compensation plans	$ (12,165)								$ (12,165)
Ending Balance, issued (in shares) at Sep. 30, 2020					4,000,000		456,590,373
Ending Balance (in shares) at Sep. 30, 2020							375,237,815		(81,352,558)
Ending Balance at Sep. 30, 2020	2,200,446				$ 400,000		$ 91,319		$ (798,068)		1,243,482		(38,941)		1,302,654
Beginning Balance, issued (in shares) at Jun. 30, 2020					4,000,000		456,585,223
Beginning Balance (in shares) at Jun. 30, 2020							375,235,787		(81,349,436)
Beginning Balance at Jun. 30, 2020	2,016,919				$ 400,000		$ 91,317		$ (798,046)		1,234,450		(44,071)		1,133,269
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	171,028														171,028
Other comprehensive income, net of tax	5,130												5,130
Total comprehensive income	176,158
Dividends, Cash [Abstract]
Preferred Stock		(2,058)														(2,058)
Common stock dividend accrual adjustment	$ 247														247
Issuance of common shares (in shares)	5,150						5,150
Issuance of common shares	$ 16						$ 2				14
Stock-based compensation expense	$ 9,186										9,018				168
Common stock repurchased (in shares)	0
Shares repurchased related to employee stock-based compensation plans (in shares)	(3,122)						(3,122)		(3,122)
Shares repurchased related to employee stock-based compensation plans	$ (22)								$ (22)
Ending Balance, issued (in shares) at Sep. 30, 2020					4,000,000		456,590,373
Ending Balance (in shares) at Sep. 30, 2020							375,237,815		(81,352,558)
Ending Balance at Sep. 30, 2020	2,200,446				$ 400,000		$ 91,319		$ (798,068)		1,243,482		(38,941)		1,302,654
Beginning Balance, issued (in shares) at Dec. 31, 2020					2,510,696		456,729,251
Beginning Balance (in shares) at Dec. 31, 2020					2,510,696		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	854,248														854,248
Other comprehensive income, net of tax	14,497												14,497
Total comprehensive income	868,745
Dividends, Cash [Abstract]
Common Stock	(29,104)														(29,104)
Preferred Stock		(3,559)														(3,559)
Dividend equivalent units related to employee stock-based compensation plans	$ (17)										522				(539)
Issuance of common shares (in shares)	3,785,490						3,785,490
Issuance of common shares	$ 4,891						$ 757				4,134
Stock-based compensation expense	24,254										24,254
Common stock repurchased and cancelled (in shares)							(28,502,460)
Common stock repurchased and cancelled	$ (472,482)						$ (5,700)				(466,782)
Common stock repurchased (in shares)	(84,528,256)						(56,025,796)		(56,025,796)
Common stock repurchased	$ (804,199)								$ (978,883)		174,684
Shares repurchased related to employee stock-based compensation plans (in shares)	(1,367,826)						(1,367,826)		(1,367,826)
Shares repurchased related to employee stock-based compensation plans	$ (20,103)								$ (20,103)
Ending Balance, issued (in shares) at Sep. 30, 2021					2,510,696		432,012,281
Ending Balance (in shares) at Sep. 30, 2021					2,510,696		293,177,407		(138,834,874)
Ending Balance at Sep. 30, 2021	2,131,261				$ 251,070		$ 86,403		$ (1,797,979)		1,068,059		(19,703)		2,543,411
Beginning Balance, issued (in shares) at Jun. 30, 2021					2,510,696		431,508,098
Beginning Balance (in shares) at Jun. 30, 2021							305,807,223		(125,700,875)
Beginning Balance at Jun. 30, 2021	2,303,378				$ 251,070		$ 86,302		$ (1,551,724)		1,058,698		(21,640)		2,480,672
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	72,840														72,840
Other comprehensive income, net of tax	1,937												1,937
Total comprehensive income	74,777
Dividends, Cash [Abstract]
Common Stock	(8,934)														(8,934)
Preferred Stock		$ (1,166)														$ (1,166)
Dividend equivalent units related to employee stock-based compensation plans	$ (1)														(1)
Issuance of common shares (in shares)	504,183						504,183
Issuance of common shares	$ 2,870						$ 101				2,769
Stock-based compensation expense	6,686										6,686
Common stock repurchased and cancelled	$ (94)										(94)
Common stock repurchased (in shares)	(13,018,585)						(13,018,585)		(13,018,585)
Common stock repurchased	$ (244,082)								$ (244,082)
Shares repurchased related to employee stock-based compensation plans (in shares)	(115,414)						(115,414)		(115,414)
Shares repurchased related to employee stock-based compensation plans	$ (2,173)								$ (2,173)
Ending Balance, issued (in shares) at Sep. 30, 2021					2,510,696		432,012,281
Ending Balance (in shares) at Sep. 30, 2021					2,510,696		293,177,407		(138,834,874)
Ending Balance at Sep. 30, 2021	$ 2,131,261				$ 251,070		$ 86,403		$ (1,797,979)		$ 1,068,059		$ (19,703)		$ 2,543,411