Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment	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
Beginning balance (in shares) at Dec. 31, 2017			146,652,615
Beginning balance at Dec. 31, 2017	$ 3,464,156	$ (5,843)	$ 146,653	$ 68,126	$ (852,592)		$ 4,049,965	$ (5,843)	$ 3,412,152	$ (5,843)	$ 52,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	810,474						810,474		810,474
Other comprehensive (loss) income, net of tax	(262,486)				(262,486)				(262,486)
Cash dividends declared	(422,352)						(422,352)		(422,352)
Share-based awards exercised, including tax benefit (in shares)			235,058
Share-based awards exercised, including tax benefit	(10,227)		$ 235	(10,462)					(10,227)
Share-based compensation	20,716			20,716					20,716
Purchase of stock (in shares)			(951,060)
Purchase of stock	$ (91,983)		$ (951)				(91,032)		(91,983)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
Noncontrolling interest activities	$ (30,464)										(30,464)
Ending balance (in shares) at Dec. 31, 2018			145,936,613
Ending balance at Dec. 31, 2018	3,471,991		$ 145,937	78,380	(1,115,078)		4,341,212		3,450,451		21,540
Ending balance (Accounting Standards Update 2018-02) at Dec. 31, 2018						$ (122,526)		122,526
Ending balance (Accounting Standards Update 2016-02) at Dec. 31, 2018		4,797						4,797		4,797
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	621,085						621,085		621,085
Other comprehensive (loss) income, net of tax	96,296				96,296				96,296
Cash dividends declared	(444,372)						(444,372)		(444,372)
Share-based awards exercised, including tax benefit (in shares)			240,568
Share-based awards exercised, including tax benefit	(11,413)		$ 240	(11,653)					(11,413)
Share-based compensation	32,050			32,050					32,050
Purchase of stock (in shares)			(799,023)
Purchase of stock	(74,187)		$ (799)				(73,388)		(74,187)
Noncontrolling interest activities	(747)										(747)
Ending balance (in shares) at Dec. 31, 2019			145,378,158
Ending 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 (loss) income	(29,102)						(29,102)		(29,102)
Other comprehensive (loss) income, net of tax	104,806				104,806				104,806
Cash dividends declared	(456,469)						(456,469)		(456,469)
Share-based awards exercised, including tax benefit (in shares)			112,621
Share-based awards exercised, including tax benefit	(4,120)		$ 113	(4,233)					(4,120)
Share-based compensation	22,621			22,621					22,621
Purchase of stock (in shares)			(1,136,444)
Purchase of stock	$ (96,215)		$ (1,137)	0			(95,078)		(96,215)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Noncontrolling interest activities	$ (7,586)										(7,586)
Ending balance (in shares) at Dec. 31, 2020			144,354,335
Ending balance at Dec. 31, 2020	$ 3,218,003		$ 144,354	$ 117,165	$ (1,036,502)		$ 3,979,779		$ 3,204,796		$ 13,207