Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Total Parent Equity	Total Parent Equity Cumulative Effect, Period of Adoption, Adjustment	Non-controlling Interests in Subsidiaries
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Dec. 31, 2019			145,378,158
Beginning balance at Dec. 31, 2019	$ 3,695,500	$ (11,432)	$ 145,378	$ 98,777	$ (1,141,308)	$ 4,571,860	$ (11,432)	$ 3,674,707	$ (11,432)	$ 20,793
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	136,535					136,535		136,535
Other comprehensive loss, 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
Beginning balance (in shares) at Dec. 31, 2020			144,354,335
Beginning balance at Dec. 31, 2020	3,218,003	$ 6,223	$ 144,354	117,165	(1,036,502)	3,979,779	$ 6,223	3,204,796	$ 6,223	13,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	217,710					217,710		217,710
Other comprehensive loss, net of tax	12,742				12,742			12,742
Cash dividends declared	(117,714)					(117,714)		(117,714)
Share-based awards exercised, including tax benefit (in shares)			103,722
Share-based awards exercised, including tax benefit	(5,429)		$ 104	(5,533)				(5,429)
Share-based compensation	6,235			6,235				6,235
Noncontrolling interest activities	(1,661)									(1,661)
Ending balance (in shares) at Mar. 31, 2021			144,458,057
Ending balance at Mar. 31, 2021	$ 3,336,109		$ 144,458	$ 117,867	$ (1,023,760)	$ 4,085,998		$ 3,324,563		$ 11,546