Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Total Parent Stockholders’ Equity	Common Stock $1 Par Value	Capital in Excess of Par Value	Retained Earnings	Cumulative Other Comprehensive (Loss) Income	Common Shares in Treasury	Noncontrolling Shareholders’ Interests in Consolidated Subsidiaries
Beginning Balance at Dec. 31, 2016	$ 1,130,236	$ 1,076,014	$ 87,850	$ 25,876	$ 2,321,424	$ (545,151)	$ (813,985)	$ 54,222
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	96,745	95,400			95,400			1,345
Net income attributable to noncontrolling shareholders' interests	1,345
Other comprehensive loss	70,048	66,673				66,673		3,375
Comprehensive income	166,793	162,073			95,400	66,673		4,720
Dividends payable to noncontrolling shareholder	(282)							(282)
Share repurchase program	(90,868)	(90,868)					(90,868)
Stock compensation plans, including tax benefit	1,791	1,791		(5,136)	(538)		7,465
Cash dividends - $0.42 per share	(21,914)	(21,914)			(21,914)
Ending Balance at Dec. 31, 2017	1,185,756	1,127,096	87,850	20,740	2,394,372	(478,478)	(897,388)	58,660
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80,563	76,586			76,586			3,977
Net income attributable to noncontrolling shareholders' interests	3,977
Other comprehensive loss	14,652	16,889				16,889		(2,237)
Comprehensive income	95,215	93,475			76,586	16,889		1,740
Share repurchase program	(30,183)	(30,183)					(30,183)
Stock compensation plans, including tax benefit	2,793	2,793		384	(106)		2,515
Cash dividends - $0.42 per share	(21,138)	(21,138)			(21,138)
Ending Balance at Dec. 31, 2018	1,232,443	1,172,043	87,850	21,124	2,449,714	(461,589)	(925,056)	60,400
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	98,317	96,404			96,404
Net income attributable to noncontrolling shareholders' interests	1,913							1,913
Other comprehensive loss	14,804	14,009				14,009		795
Comprehensive income	113,121	110,413			96,404	14,009		2,708
Stock compensation plans, including tax benefit	3,237	3,237		1,051	(87)		2,273
Cash dividends - $0.42 per share	(21,068)	(21,068)			(21,068)
Ending Balance at Dec. 31, 2019	$ 1,327,733	$ 1,264,625	$ 87,850	$ 22,175	$ 2,524,963	$ (447,580)	$ (922,783)	$ 63,108