Stockholders' Equity - Reconciliation of Beginning and End of Period Equity Accounts (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,195,740	$ 1,327,733	$ 1,248,221	$ 1,232,443	$ 1,327,733	$ 1,232,443
Net (loss) income	(5,643)	(11,317)	9,258	7,180	(16,960)	16,438
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest		(53,226)
Other comprehensive income	10,944		297	14,150	(42,282)	14,447
Stock compensation plans	1,707	99	1,517	(290)
Cash dividends	(5,277)	(5,277)	(5,267)	(5,262)
Acquisition of noncontrolling shareholders' interest		(62,272)
Ending Balance	$ 1,197,471	1,195,740	$ 1,254,026	1,248,221	$ 1,197,471	$ 1,254,026
Dividends paid (in dollars per share)	$ 0.105		$ 0.105		$ 0.105	$ 0.105
Total Parent Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,177,712	1,264,625	$ 1,186,641	1,172,043	$ 1,264,625	$ 1,172,043
Net (loss) income	(6,215)	(11,591)	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	10,855		637	13,170
Stock compensation plans	1,707	99	1,517	(290)
Cash dividends	(5,277)	(5,277)	(5,267)	(5,262)
Acquisition of noncontrolling shareholders' interest		(17,462)
Ending Balance	1,178,782	1,177,712	1,192,349	1,186,641	1,178,782	1,192,349
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
Ending Balance	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	15,226	22,175	19,545	21,124	22,175	21,124
Stock compensation plans	1,707	(1,235)	1,292	(1,579)
Acquisition of noncontrolling shareholders' interest		(5,714)
Ending Balance	16,933	15,226	20,837	19,545	16,933	20,837
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,508,052	2,524,963	2,451,368	2,449,714	2,524,963	2,449,714
Net (loss) income	(6,215)	(11,591)	8,821	6,980
Stock compensation plans		(43)	(111)	(64)
Cash dividends	(5,277)	(5,277)	(5,267)	(5,262)
Ending Balance	2,496,560	2,508,052	2,454,811	2,451,368	2,496,560	2,454,811
Cumulative Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(512,010)	(447,580)	(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	10,855		637	13,170
Acquisition of noncontrolling shareholders' interest		(11,748)
Ending Balance	(501,155)	(512,010)	(447,782)	(448,419)	(501,155)	(447,782)
Common Shares in Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(921,406)	(922,783)	(923,703)	(925,056)	(922,783)	(925,056)
Stock compensation plans		1,377	336	1,353
Ending Balance	(921,406)	(921,406)	(923,367)	(923,703)	(921,406)	(923,367)
Noncontrolling Shareholders’ Interests in Consolidated Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	18,028	63,108	61,580	60,400	63,108	60,400
Net (loss) income	572	274	437	200
Other comprehensive loss, excluding currency loss charged to equity as part of acquisition of noncontrolling shareholder interest		(544)
Other comprehensive income	89		(340)	980
Acquisition of noncontrolling shareholders' interest		(44,810)
Ending Balance	$ 18,689	$ 18,028	$ 61,677	$ 61,580	$ 18,689	$ 61,677