Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Series C Preferred Stock	Total	Total Series C Preferred Stock	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Series C Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Other	Non-controlling Interest	Cumulative Effect, Period of Adoption, Adjustment	[1]	Cumulative Effect, Period of Adoption, Adjustment Total	[1]	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings	[1]	Cumulative Effect, Period of Adoption, Adjustment Non-controlling Interest	[1]	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Total	Cumulative Effect, Period of Adoption, Adjusted Balance Preferred Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional Paid-in Capital	Cumulative Effect, Period of Adoption, Adjusted Balance Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjusted Balance Other	Cumulative Effect, Period of Adoption, Adjusted Balance Non-controlling Interest
Balance (in shares) at Dec. 31, 2019					7,000	152,965,571																	7,000	152,965,571
Balance at Dec. 31, 2019	$ 5,727,241		$ 5,707,015		$ 169,302	$ 152,966	$ 3,462,080	$ 1,896,427		$ 54,277	$ (28,037)	$ 20,226	$ (159,249)		$ (159,323)		$ (159,323)		$ 74		$ 5,567,992	$ 5,547,692	$ 169,302	$ 152,966	$ 3,462,080	$ 1,737,104	$ 54,277	$ (28,037)	$ 20,300
Increase (Decrease) in Equity
Income after income tax expense	53,816		51,899					51,899				1,917
Other comprehensive income (loss), net of tax	111,893		111,893							111,893
Net investment by (distribution to) non-controlling interest	$ 7,932											7,932
Repurchases of shares of common stock (in shares)	(873,376)					(873,376)
Repurchases of shares of common stock	$ (33,098)		(33,098)			$ (873)	(32,225)				0
Dividends on 5.70% Series C Preferred Stock		$ (2,493)		$ (2,493)					$ (2,493)
Dividends on common stock	(53,578)		(53,578)					(53,578)
Stock compensation plans, net of tax (in shares)						93,789
Stock compensation plans, net of tax	3,369		3,369			$ 93	3,276				0
Change in shares held in trust for deferred compensation plans, at cost							103				(103)
Balance (in shares) at Mar. 31, 2020					7,000	152,185,984
Balance at Mar. 31, 2020	5,655,833		5,625,684		$ 169,302	$ 152,186	3,433,234	1,732,932		166,170	(28,140)	30,149
Balance (in shares) at Dec. 31, 2020					7,000	152,565,504
Balance at Dec. 31, 2020	$ 5,689,297		5,670,813		$ 169,302	$ 152,566	3,457,802	1,735,201		182,673	(26,731)	18,484
Increase (Decrease) in Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Income after income tax expense	$ 125,109		123,336					123,336				1,773
Other comprehensive income (loss), net of tax	(180,019)		(180,019)							(180,019)
Net investment by (distribution to) non-controlling interest	$ 7,680											7,680
Repurchases of shares of common stock (in shares)	0
Dividends on 5.70% Series C Preferred Stock		$ (2,493)		$ (2,493)					$ (2,493)
Dividends on common stock	$ (53,704)		(53,704)					(53,704)
Stock compensation plans, net of tax (in shares)						130,629
Stock compensation plans, net of tax	5,901		5,901			$ 130	5,771				0
Change in shares held in trust for deferred compensation plans, at cost							3,082				(3,082)
Balance (in shares) at Mar. 31, 2021					7,000	152,696,133
Balance at Mar. 31, 2021	$ 5,591,771		$ 5,563,834		$ 169,302	$ 152,696	$ 3,466,655	$ 1,802,340		$ 2,654	$ (29,813)	$ 27,937

[1] See "Note 2. Summary of Significant Accounting Policies" in our Annual Report on Form 10-K for the year ended December 31, 2020 for further information.