CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Total Shareholders’ Equity	Common Stock and Additional Paid-In Capital	Retained Earnings	Cumulative Translation Adjustment	Retirement Benefits Adjustment	Cumulative Unrealized Gain (Loss) on Derivatives	Treasury Stock	Noncontrolling Interest
Balance at Dec. 31, 2019	$ 2,263,229		$ 761,352	$ 2,615,131	$ (94,353)	$ (25,809)	$ (7,183)	$ (985,909)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	101,998			101,998
Cumulative translation adjustment	(26,456)				(26,456)
Net change in retirement obligations (net of tax)	2,296					2,296
Net change on derivatives designated as cash flow hedges (net of tax)	1,194						1,194
Issuance of shares of common stock from issuance of unvested shares, performance share units and exercise of stock options (net of tax)	2,089							2,089
Repurchase of 866,823 shares of common stock	(108,907)							(108,907)
Shares surrendered for tax withholding	(12,119)							(12,119)
Share-based compensation	6,463		6,463
Balance at Mar. 31, 2020	2,229,787		767,815	2,717,129	(120,809)	(23,513)	(5,989)	(1,104,846)
Balance at Dec. 31, 2019	2,263,229		761,352	2,615,131	(94,353)	(25,809)	(7,183)	(985,909)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	172,862
Net income	172,862
Net change in retirement obligations (net of tax)	1,665
Repurchase of 866,823 shares of common stock	(110,300)
Balance at Jun. 30, 2020	2,261,037		773,568	2,712,312	(101,538)	(24,144)	(3,873)	(1,095,288)
Balance at Mar. 31, 2020	2,229,787		767,815	2,717,129	(120,809)	(23,513)	(5,989)	(1,104,846)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	70,864
Net income	70,864			70,864
Cumulative translation adjustment	19,271				19,271
Net change in retirement obligations (net of tax)	(631)					(631)
Net change on derivatives designated as cash flow hedges (net of tax)	2,116						2,116
Issuance of shares of common stock from issuance of unvested shares, performance share units and exercise of stock options (net of tax)	11,022							11,022
Repurchase of 866,823 shares of common stock	(1,435)							(1,435)
Shares surrendered for tax withholding	(29)							(29)
Share-based compensation	5,753		5,753
Cash dividends declared	(75,681)			(75,681)
Balance at Jun. 30, 2020	2,261,037		773,568	2,712,312	(101,538)	(24,144)	(3,873)	(1,095,288)
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
Balance at Dec. 31, 2020	2,540,203
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	112,672	112,708		112,708					(36)
Cumulative translation adjustment	(48,437)	(48,439)			(48,439)				2
Net change in retirement obligations (net of tax)	745	745				745
Net change on derivatives designated as cash flow hedges (net of tax)	664	664					664
Issuance of shares of common stock from issuance of unvested shares, performance share units and exercise of stock options (net of tax)	3,231	3,231						3,231
Shares surrendered for tax withholding	(5,460)	(5,460)						(5,460)
Share-based compensation	6,274	6,274	6,274
Balance at Mar. 31, 2021	2,610,015	2,609,926	782,328	2,954,254	(35,009)	(23,679)	(1,867)	(1,066,101)	89
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
Balance at Dec. 31, 2020	2,540,203
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	214,851
Net income	214,903
Net change in retirement obligations (net of tax)	9,955
Balance at Jun. 30, 2021	2,672,864	2,672,796	786,575	2,974,163	(14,754)	(14,469)	0	(1,058,719)	68
Balance at Jun. 30, 2021	2,672,796
Balance at Mar. 31, 2021	2,610,015	2,609,926	782,328	2,954,254	(35,009)	(23,679)	(1,867)	(1,066,101)	89
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	102,179	102,195		102,195					(16)
Net income	102,195
Cumulative translation adjustment	20,250	20,255			20,255				(5)
Net change in retirement obligations (net of tax)	9,210	9,210				9,210
Net change on derivatives designated as cash flow hedges (net of tax)	1,867	1,867					1,867
Issuance of shares of common stock from issuance of unvested shares, performance share units and exercise of stock options (net of tax)	7,456	7,456						7,456
Shares surrendered for tax withholding	(74)	(74)						(74)
Share-based compensation	4,247	4,247	4,247
Cash dividends declared	(82,286)	(82,286)		(82,286)
Balance at Jun. 30, 2021	2,672,864	$ 2,672,796	$ 786,575	$ 2,974,163	$ (14,754)	$ (14,469)	$ 0	$ (1,058,719)	$ 68
Balance at Jun. 30, 2021	$ 2,672,796