Condensed Consolidated Statements of Equity - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Parent Equity	Non-controlling Interests in Subsidiaries
Beginning balance (in shares) at Dec. 31, 2018			145,936,613
Beginning balance at Dec. 31, 2018		$ 3,471,991	$ 145,937	$ 78,380	$ (1,115,078)	$ 4,341,212	$ 3,450,451	$ 21,540
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		160,250				160,250	160,250
Other comprehensive income, net of tax		47,617			47,617		47,617
Cash dividends declared		(111,355)				(111,355)	(111,355)
Share-based awards exercised, including tax benefit (in shares)			127,298
Share-based awards exercised, including tax benefit		(6,839)	$ 127	(6,966)			(6,839)
Share-based compensation		6,010		6,010			6,010
Purchase of stock | Accounting Standards Update 2018-02	[1]	0			(122,526)	122,526
Noncontrolling interest activities		361						361
Ending balance (in shares) at Mar. 31, 2019			146,063,911
Ending balance at Mar. 31, 2019		3,572,832	$ 146,064	77,424	(1,189,987)	4,517,430	3,550,931	21,901
Beginning balance (in shares) at Dec. 31, 2019			145,378,158
Beginning balance at Dec. 31, 2019		3,695,500	$ 145,378	98,777	(1,141,308)	4,571,860	3,674,707	20,793
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		136,535				136,535	136,535
Other comprehensive income, net of tax		(192,021)			(192,021)		(192,021)
Cash dividends declared		(114,476)				(114,476)	(114,476)
Share-based awards exercised, including tax benefit (in shares)			7,629
Share-based awards exercised, including tax benefit		(341)	$ 7	(348)			(341)
Share-based compensation		5,449		5,449			5,449
Purchase of stock (in shares)			(1,136,444)
Purchase of stock		(95,719)	$ (1,136)			(94,583)	(95,719)
Noncontrolling interest activities		(464)						(464)
Ending balance (in shares) at Mar. 31, 2020			144,249,343
Ending balance at Mar. 31, 2020		$ 3,423,031	$ 144,249	$ 103,878	$ (1,333,329)	$ 4,487,904	$ 3,402,702	$ 20,329

[1]