Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 1,410,591	$ 1,327,733
Net income (loss)	22,090	(11,317)
Other comprehensive income (loss)	(4,879)	(64,974)
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest		(53,226)
Stock compensation plans	277	99
Cash dividends - 0.105 per share	(5,301)	(5,277)
Acquisition of noncontrolling shareholders' interest		(62,272)
Balance at end of period	$ 1,422,778	$ 1,195,740
Dividends paid (in USD per share)	$ 0.105	$ 0.105
Total Parent Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 1,388,899	$ 1,264,625
Net income (loss)	22,059	(11,591)
Other comprehensive income (loss)	(4,553)
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest		(52,682)
Stock compensation plans	277	99
Cash dividends - 0.105 per share	(5,301)	(5,277)
Acquisition of noncontrolling shareholders' interest		(17,462)
Balance at end of period	1,401,381	1,177,712
Common Stock $1 Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	87,850	87,850
Balance at end of period	87,850	87,850
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	20,815	22,175
Stock compensation plans	(1,892)	(1,235)
Acquisition of noncontrolling shareholders' interest		(5,714)
Balance at end of period	18,923	15,226
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	2,646,567	2,524,963
Net income (loss)	22,059	(11,591)
Stock compensation plans	(111)	(43)
Cash dividends - 0.105 per share	(5,301)	(5,277)
Balance at end of period	2,663,214	2,508,052
Cumulative Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(446,909)	(447,580)
Other comprehensive income (loss)	(4,553)
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest		(52,682)
Acquisition of noncontrolling shareholders' interest		(11,748)
Balance at end of period	(451,462)	(512,010)
Common Shares in Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(919,424)	(922,783)
Stock compensation plans	2,280	1,377
Balance at end of period	(917,144)	(921,406)
Noncontrolling Shareholders’ Interests in Consolidated Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	21,692	63,108
Net income (loss)	31	274
Other comprehensive income (loss)	(326)
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest		(544)
Acquisition of noncontrolling shareholders' interest		(44,810)
Balance at end of period	$ 21,397	$ 18,028