Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands	Total	Total Equity [Member]	Total Shareholders' Equity [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interests [Member]	Redeemable Noncontrolling Interests [Member]
Balance at Dec. 31, 2014		$ 7,602,002	$ 7,594,818	$ 3,308,395	$ 2,581,866	$ 1,704,557	$ 7,184
Balance, shares at Dec. 31, 2014				13,962
Balance, redeemable noncontrolling interests at Dec. 31, 2014								$ 61,048
Net income	$ 286,459	283,138	282,361		282,361	0	777	3,321
Other comprehensive income (loss)	(133,535)	(133,479)	(133,479)		0	(133,479)	0	(56)
Comprehensive Income (Loss)	152,924	149,659	148,882				777	3,265
Issuance of common stock		3,609	3,609	$ 3,609	0	0	0	0
Issuance of common stock, shares				15
Repurchase of common stock		(22,670)	(22,670)	$ 0	(22,670)	0	0	0
Repurchase of common stock, shares				(27)
Restricted stock units expensed		14,968	14,968	$ 14,968	0	0	0	0
Restricted stock units expensed, shares				0
Adjustment of redeemable noncontrolling interests		1,715	1,715	$ 0	1,715	0	0	(1,715)
Adjustment of redeemable noncontrolling interests, shares				0
Purchase of noncontrolling interest		(1,447)	(1,447)	$ (1,447)	0	0	0	(8,224)
Purchase of noncontrolling interest, shares				0
Other		2,040	1,995	$ 1,964	31	0	45	(2,482)
Other, shares				0
Balance at Jun. 30, 2015		7,749,876	7,741,870	$ 3,327,489	2,843,303	1,571,078	8,006
Balance, shares at Jun. 30, 2015				13,950
Balance, redeemable noncontrolling interests at Jun. 30, 2015								51,892
Balance at Dec. 31, 2015	7,840,609	7,840,609	7,834,150	$ 3,342,357	3,137,285	1,354,508	6,459
Balance, shares at Dec. 31, 2015				13,959
Balance, redeemable noncontrolling interests at Dec. 31, 2015	62,958							62,958
Net income	244,319	239,957	239,167		239,167	0	790	4,362
Other comprehensive income (loss)	367,788	367,769	367,769		0	367,769	0	19
Comprehensive Income (Loss)	612,107	607,726	606,936				790	4,381
Issuance of common stock		4,101	4,101	$ 4,101	0	0	0	0
Issuance of common stock, shares				48
Repurchase of common stock		(15,206)	(15,206)	$ 0	(15,206)	0	0	0
Repurchase of common stock, shares				(16)
Restricted stock units expensed		13,473	13,473	$ 13,473	0	0	0	0
Restricted stock units expensed, shares				0
Adjustment of redeemable noncontrolling interests		(5,981)	(5,981)	$ 0	(5,981)	0	0	5,981
Adjustment of redeemable noncontrolling interests, shares				0
Purchase of noncontrolling interest		899	899	$ 899	0	0	0	(3,977)
Purchase of noncontrolling interest, shares				0
Other		(48)	(3)	$ 0	(3)	0	(45)	(3,142)
Other, shares				0
Balance at Jun. 30, 2016	8,445,573	$ 8,445,573	$ 8,438,369	$ 3,360,830	$ 3,355,262	$ 1,722,277	$ 7,204
Balance, shares at Jun. 30, 2016				13,991
Balance, redeemable noncontrolling interests at Jun. 30, 2016	$ 66,201							$ 66,201