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	$ (2,709)			$ 2,709		$ (2,709)
Balance, beginning of period, adjusted	3,518,334	$ 4	$ 1,035,895	3,051,196	$ (552,845)	(38,883)	$ 3,495,367	$ 22,967
Balance, beginning of period (in shares) at Dec. 31, 2017		75,148			9,753
Balance, beginning of period at Dec. 31, 2017	3,518,334	$ 4	1,035,895	3,048,487	$ (552,845)	(36,174)	3,495,367	22,967
Net income	105,347			105,562			105,562	(215)
Other comprehensive income (loss)	(72,308)					(72,308)	(72,308)
Repurchase of common stock (in shares)					83
Repurchase of common stock	(7,584)				$ (7,584)		(7,584)
Stock options exercised (in shares)		43
Stock options exercised	2,274		2,274				2,274
Non-vested shares awarded, net (in shares)		127
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			0
Vesting of non-vested shares (in shares)					23
Vesting of non-vested shares	(2,172)				$ (2,172)		(2,172)
Share-based compensation	3,073		3,073				3,073
Cash dividends on common stock	(29,183)			(29,183)			(29,183)
Capital calls and distributions, net	(439)							(439)
Balance, end of period (in shares) at Mar. 31, 2018		75,318			9,859
Balance, end of period at Mar. 31, 2018	3,517,342	$ 4	1,041,242	3,127,575	$ (562,601)	(111,191)	3,495,029	22,313
Transition adjustment for new accounting principle in period of adoption	2,862			2,862		0	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
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, 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