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	Preferred Stock 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	362,173														362,173
Other comprehensive loss, net of tax	(30,907)												(30,907)
Total comprehensive income	331,266
Dividends, Cash [Abstract]
Common Stock	(12,595)														(12,595)
Preferred Stock		$ (3,464)														$ (3,464)
Dividend equivalent units related to employee stock-based compensation plans	$ 0										265				(265)
Issuance of common shares (in shares)	2,837,562						2,837,562
Issuance of common shares	$ 2,872						$ 568				2,304
Stock-based compensation expense	$ 13,610										13,610				0
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)	(1,105,119)						(1,105,119)		(1,105,119)
Shares repurchased related to employee stock-based compensation plans	$ (12,136)								$ (12,136)
Ending Balance, issued (in shares) at Mar. 31, 2020					4,000,000		456,437,488
Ending Balance (in shares) at Mar. 31, 2020							375,088,960		(81,348,528)
Ending Balance at Mar. 31, 2020	2,120,583				$ 400,000		$ 91,288		$ (798,039)		1,226,886		(43,274)		1,243,722
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	641,207														641,207
Other comprehensive loss, net of tax	10,123												10,123
Total comprehensive income	651,330
Dividends, Cash [Abstract]
Common Stock	(10,906)														(10,906)
Preferred Stock		$ (1,201)														$ (1,201)
Dividend equivalent units related to employee stock-based compensation plans	$ (16)										463				(479)
Issuance of common shares (in shares)	2,826,387						2,826,387
Issuance of common shares	$ 2,061						$ 565				1,496
Stock-based compensation expense	11,124										11,124
Common stock repurchased and cancelled (in shares)							(28,502,460)
Common stock repurchased and cancelled	$ (471,810)						$ (5,700)				(466,110)
Common stock repurchased (in shares)	(48,702,830)						(20,200,370)		(20,200,370)
Common stock repurchased	$ (120,640)								$ (295,324)		174,684
Shares repurchased related to employee stock-based compensation plans (in shares)	(1,059,980)						(1,059,980)		(1,059,980)
Shares repurchased related to employee stock-based compensation plans	$ (14,313)								$ (14,313)
Ending Balance, issued (in shares) at Mar. 31, 2021					2,510,696		431,053,178
Ending Balance (in shares) at Mar. 31, 2021							328,351,576		(102,701,602)
Ending Balance at Mar. 31, 2021	$ 2,608,464				$ 251,070		$ 86,211		$ (1,108,630)		$ 1,052,904		$ (24,077)		$ 2,350,986