CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Total Shareholders’ Equity	Total Shareholders’ Equity Cumulative Effect, Period of Adoption, Adjustment	Common Stock and Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Cumulative Translation Adjustment	Retirement Benefits Adjustments	Retirement Benefits Adjustments Cumulative Effect, Period of Adoption, Adjustment	Cumulative Unrealized Gain (Loss)  on Derivatives	Cumulative Unrealized Gain (Loss)  on Derivatives Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Noncontrolling Interest
Beginning balance at Dec. 31, 2017	$ 1,886,542		$ 1,886,542		$ 717,808	$ 2,057,915		$ (46,306)	$ (29,154)		$ (14,047)		$ (799,674)	$ 0
Beginning balance (Accounting Standards Update 2016-16) at Dec. 31, 2017		$ (645)		$ (645)			$ (645)
Beginning balance (Accounting Standards Update 2018-02) at Dec. 31, 2017		0		0			6,435			$ (3,411)		$ (3,024)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	410,573		410,573			410,573
Cumulative translation adjustment	(48,114)		(48,114)					(48,114)
Net change in retirement obligations, net of tax	9,825		9,825						9,825
Net change on derivatives designated as cash flow hedges, net of tax	5,006		5,006								5,006
Issuance of shares of common stock from issuance of unvested shares, performance share units and exercise of stock options	27,701		27,701										27,701
Repurchase of common stock	(173,926)		(173,926)										(173,926)
Share-based compensation	21,432		21,432		21,432
Shares surrendered for tax withholding	(11,555)		(11,555)										(11,555)
Cash dividends declared	(132,199)		(132,199)			(132,199)
Ending balance at Dec. 31, 2018	$ 1,994,640	$ 28	1,994,640	$ 28	739,240	2,342,079	$ 28	(94,420)	(22,740)		(12,065)		(957,454)	0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 425,521		425,521			425,521
Cumulative translation adjustment	67		67					67
Net change in retirement obligations, net of tax	(3,069)		(3,069)						(3,069)
Net change on derivatives designated as cash flow hedges, net of tax	4,882		4,882								4,882
Issuance of shares of common stock from issuance of unvested shares, performance share units and exercise of stock options	38,809		38,809										38,809
Repurchase of common stock	(54,668)		(54,668)										(54,668)
Share-based compensation	22,112		22,112		22,112
Shares surrendered for tax withholding	(12,596)		(12,596)										(12,596)
Cash dividends declared	(152,497)		(152,497)			(152,497)
Ending balance at Dec. 31, 2019	2,263,229		2,263,229		761,352	2,615,131		(94,353)	(25,809)		(7,183)		(985,909)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	377,778		377,778			377,778
Cumulative translation adjustment	107,783		107,783					107,783
Net change in retirement obligations, net of tax	1,385		1,385						1,385
Net change on derivatives designated as cash flow hedges, net of tax	4,652		4,652								4,652
Issuance of shares of common stock from issuance of unvested shares, performance share units and exercise of stock options	44,587		44,587										44,587
Repurchase of common stock	(110,342)		(110,342)										(110,342)
Share-based compensation	14,702		14,702		14,702
Shares surrendered for tax withholding	(12,208)		(12,208)										(12,208)
Cash dividends declared	(151,363)		(151,363)			(151,363)
Contributions received from joint venture partner	123		0											123
Ending balance at Dec. 31, 2020	$ 2,540,326		$ 2,540,203		$ 776,054	$ 2,841,546		$ 13,430	$ (24,424)		$ (2,531)		$ (1,063,872)	$ 123