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, 2013		$ 6,678,010	$ 6,673,577	$ 3,288,863	$ 2,294,909	$ 1,089,805	$ 4,433
Balance, shares at Dec. 31, 2013				13,986
Balance, redeemable noncontrolling interests at Dec. 31, 2013								$ 72,183
Net income (loss)	$ 128,642	127,141	127,784		127,784	0	(643)	1,501
Other comprehensive income (loss)	353,089	353,077	353,077		0	353,077	0	12
Comprehensive Income (Loss)	481,731	480,218	480,861				(643)	1,513
Issuance of common stock		4,722	4,722	$ 4,722	0	0	0	0
Issuance of common stock, shares				15
Repurchase of common stock		(17,407)	(17,407)	$ 0	(17,407)	0	0	0
Repurchase of common stock, shares				(30)
Restricted stock units expensed		13,390	13,390	$ 13,390	0	0	0	0
Restricted stock units expensed, shares				0
Adjustment of redeemable noncontrolling interests		(2,584)	(2,584)	$ 0	(2,584)	0	0	2,584
Adjustment of redeemable noncontrolling interests, shares				0
Purchase of noncontrolling interest		(9,352)	(10,257)	$ (10,257)	0	0	905	(18,566)
Purchase of noncontrolling interest, shares				0
Other		4,657	755	$ 744	11	0	3,902	(2,230)
Other, shares				0
Balance at Jun. 30, 2014		7,151,654	7,143,057	$ 3,297,462	2,402,713	1,442,882	8,597
Balance, shares at Jun. 30, 2014				13,971
Balance, redeemable noncontrolling interests at Jun. 30, 2014								55,484
Balance at Dec. 31, 2014	7,602,002	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							61,048
Net income (loss)	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	$ 7,749,876	$ 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							$ 51,892