Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Shareholders' Equity [Member]	Non-Controlling Interests [Member]
Transition adjustment for new accounting principle in period of adoption	$ 2,862			$ 2,862			$ 2,862
Balance, beginning of period, adjusted	4,445,907	$ 5	$ 1,334,030	3,372,516	$ (198,995)	$ (72,585)	4,434,971	$ 10,936
Balance, beginning of period (in shares) at Dec. 31, 2018		75,711			3,589
Balance, beginning of period at Dec. 31, 2018	4,443,045	$ 5	1,334,030	3,369,654	$ (198,995)	(72,585)	4,432,109	10,936
Net income	110,265			110,612			110,612	(347)
Other comprehensive income (loss)	69,054					69,054	69,054
Repurchase of common stock (in shares)					705
Repurchase of common stock	(60,577)				$ (60,577)		(60,577)
Stock options exercised (in shares)		18
Stock options exercised	879		879				879
Non-vested shares awarded, net (in shares)		33
Non-vested shares awarded, net			0
Vesting of non-vested shares (in shares)					18
Vesting of non-vested shares	(1,428)				$ (1,428)		(1,428)
Share-based compensation	5,414		5,414				5,414
Cash dividends on common stock	(36,052)			(36,052)			(36,052)
Capital calls and distributions, net	(1,753)							(1,753)
Balance, end of period (in shares) at Mar. 31, 2019		75,762			4,312
Balance, end of period at Mar. 31, 2019	4,531,709	$ 5	1,340,323	3,447,076	$ (261,000)	(3,531)	4,522,873	8,836
Transition adjustment for new accounting principle in period of adoption	(46,696)			(46,696)			(46,696)
Balance, beginning of period, adjusted	4,817,223	$ 5	1,350,995	3,683,082	$ (329,906)	104,923	4,809,099	8,124
Balance, beginning of period (in shares) at Dec. 31, 2019		75,759			5,179
Balance, beginning of period at Dec. 31, 2019	4,863,919	$ 5	1,350,995	3,729,778	$ (329,906)	104,923	4,855,795	8,124
Net income	61,984			62,079			62,079	(95)
Other comprehensive income (loss)	226,369					226,369	226,369
Repurchase of common stock (in shares)					442
Repurchase of common stock	(33,380)				$ (33,380)		(33,380)
Stock options exercised (in shares)		10
Stock options exercised	586		586				586
Non-vested shares awarded, net (in shares)		232
Non-vested shares awarded, net			0
Vesting of non-vested shares (in shares)					71
Vesting of non-vested shares	(5,608)				$ (5,608)		(5,608)
Share-based compensation	3,245		3,245				3,245
Cash dividends on common stock	(36,142)			(36,142)			(36,142)
Capital calls and distributions, net	(117)							(117)
Balance, end of period (in shares) at Mar. 31, 2020		76,001			5,692
Balance, end of period at Mar. 31, 2020	$ 5,034,160	$ 5	$ 1,354,826	$ 3,709,019	$ (368,894)	$ 331,292	$ 5,026,248	$ 7,912