Stockholders' Equity - Reconciliation of Beginning and End of Period Equity Accounts (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,197,471	$ 1,195,740	$ 1,327,733	$ 1,254,026	$ 1,248,221	$ 1,232,443	$ 1,327,733	$ 1,232,443
Net income	123,123	(5,643)	(11,317)	29,008	9,258	7,180	106,163	45,447
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest			(53,226)
Other comprehensive income (loss)	29,484	10,944		(9,979)	297	14,150	(12,798)	4,468
Stock compensation plans	3,838	1,707	99	678	1,517	(290)
Cash dividends	(5,286)	(5,277)	(5,277)	(5,270)	(5,267)	(5,262)
Acquisition of noncontrolling shareholders' interest			(62,272)
Ending Balance	$ 1,348,630	$ 1,197,471	$ 1,195,740	$ 1,268,463	$ 1,254,026	$ 1,248,221	1,348,630	1,268,463
Dividends paid (in dollars per share)	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105
Total Parent Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,178,782	$ 1,177,712	$ 1,264,625	$ 1,192,349	$ 1,186,641	$ 1,172,043	1,264,625	1,172,043
Net income	122,604	(6,215)	(11,591)	29,344	8,821	6,980
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest			(52,682)
Other comprehensive income (loss)	28,169	10,855		(7,991)	637	13,170
Stock compensation plans	3,838	1,707	99	678	1,517	(290)
Cash dividends	(5,286)	(5,277)	(5,277)	(5,270)	(5,267)	(5,262)
Acquisition of noncontrolling shareholders' interest			(17,462)
Ending Balance	1,328,107	1,178,782	1,177,712	1,209,110	1,192,349	1,186,641	1,328,107	1,209,110
Common Stock $1 Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	87,850	87,850	87,850	87,850	87,850	87,850	87,850	87,850
Ending Balance	87,850	87,850	87,850	87,850	87,850	87,850	87,850	87,850
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	16,933	15,226	22,175	20,837	19,545	21,124	22,175	21,124
Stock compensation plans	2,349	1,707	(1,235)	637	1,292	(1,579)
Acquisition of noncontrolling shareholders' interest			(5,714)
Ending Balance	19,282	16,933	15,226	21,474	20,837	19,545	19,282	21,474
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,496,560	2,508,052	2,524,963	2,454,811	2,451,368	2,449,714	2,524,963	2,449,714
Net income	122,604	(6,215)	(11,591)	29,344	8,821	6,980
Stock compensation plans	(10)		(43)	(208)	(111)	(64)
Cash dividends	(5,286)	(5,277)	(5,277)	(5,270)	(5,267)	(5,262)
Ending Balance	2,613,868	2,496,560	2,508,052	2,478,677	2,454,811	2,451,368	2,613,868	2,478,677
Cumulative Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(501,155)	(512,010)	(447,580)	(447,782)	(448,419)	(461,589)	(447,580)	(461,589)
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest			(52,682)
Other comprehensive income (loss)	28,169	10,855		(7,991)	637	13,170
Acquisition of noncontrolling shareholders' interest			(11,748)
Ending Balance	(472,986)	(501,155)	(512,010)	(455,773)	(447,782)	(448,419)	(472,986)	(455,773)
Common Shares in Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(921,406)	(921,406)	(922,783)	(923,367)	(923,703)	(925,056)	(922,783)	(925,056)
Stock compensation plans	1,499		1,377	249	336	1,353
Ending Balance	(919,907)	(921,406)	(921,406)	(923,118)	(923,367)	(923,703)	(919,907)	(923,118)
Noncontrolling Shareholders’ Interests in Consolidated Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	18,689	18,028	63,108	61,677	61,580	60,400	63,108	60,400
Net income	519	572	274	(336)	437	200
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest			(544)
Other comprehensive income (loss)	1,315	89		(1,988)	(340)	980
Acquisition of noncontrolling shareholders' interest			(44,810)
Ending Balance	$ 20,523	$ 18,689	$ 18,028	$ 59,353	$ 61,677	$ 61,580	$ 20,523	$ 59,353