Condensed Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Deferred Compensation Obligation	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance — (in shares) at Dec. 31, 2017		176,793			46,471,000
Balance — at Dec. 31, 2017	$ 1,670,954	$ 220,991	$ 488,326	$ 3,503,947	$ (2,059,558)	$ 6,354	$ (505,473)	$ 16,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock activity under stock plans (in shares)					231,000
Stock activity under stock plans	(3,368)		(13,391)		$ 10,023
Stock-based compensation	14,131		14,131
Net earnings	60,685							4,117
Cash dividends declared	(75,106)			(75,106)
Other comprehensive income (loss), net of tax	(52,934)						(54,086)	1,152
Other, net	(3,277)					671		(3,948)
Net Income (Loss) Attributable to Parent	56,568
Balance — (in shares) at Sep. 30, 2018		176,793			46,240,000
Balance — at Sep. 30, 2018	1,630,727	$ 220,991	489,066	3,505,051	$ (2,049,535)	7,025	(559,559)	17,688
Balance — (in shares) at Jun. 30, 2018		176,793			46,241,000
Balance — at Jun. 30, 2018	1,641,551	$ 220,991	483,477	3,502,006	$ (2,049,549)	6,933	(542,198)	19,891
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock activity under stock plans (in shares)					1,000
Stock activity under stock plans	(132)		(146)		$ 14
Stock-based compensation	5,735		5,735
Net earnings	29,439			28,205				1,234
Cash dividends declared	(25,160)			(25,160)
Other comprehensive income (loss), net of tax	(17,018)						(17,361)	343
Other, net	(3,688)					92		(3,780)
Net Income (Loss) Attributable to Parent	28,205
Balance — (in shares) at Sep. 30, 2018		176,793			46,240,000
Balance — at Sep. 30, 2018	$ 1,630,727	$ 220,991	489,066	3,505,051	$ (2,049,535)	7,025	(559,559)	17,688
Balance — (in shares) at Dec. 31, 2018	176,793,000	176,793			46,237,000
Balance — at Dec. 31, 2018	$ 1,660,780	$ 220,991	494,551	3,543,007	$ (2,049,404)	7,117	(573,947)	18,465
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock activity under stock plans (in shares)					298,000
Stock activity under stock plans	(3,273)		(17,129)		$ 12,696	1,160
Stock-based compensation	22,508		22,508
Net earnings	190,534							6,659
Cash dividends declared	(75,756)			(75,756)
Repurchases of common shares (in shares)					(114,000)
Repurchases of common shares	(5,432)				$ (5,432)
Other comprehensive income (loss), net of tax	(19,303)						(19,902)	599
Other, net	(254)							(254)
Net Income (Loss) Attributable to Parent	$ 183,875
Balance — (in shares) at Sep. 30, 2019	176,793,000	176,793			46,053,000
Balance — at Sep. 30, 2019	$ 1,769,804	$ 220,991	499,930	3,651,126	$ (2,042,140)	8,277	(593,849)	25,469
Balance — (in shares) at Jun. 30, 2019		176,793			45,943,000
Balance — at Jun. 30, 2019	1,749,788	$ 220,991	493,037	3,607,928	$ (2,036,857)	8,219	(567,007)	23,477
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock activity under stock plans (in shares)					4,000
Stock activity under stock plans	(53)		(260)		$ 149	58
Stock-based compensation	7,153		7,153
Net earnings	70,563			68,443				2,120
Cash dividends declared	(25,245)			(25,245)
Repurchases of common shares (in shares)					(114,000)
Repurchases of common shares	(5,432)				$ (5,432)
Other comprehensive income (loss), net of tax	(26,908)						(26,842)	(66)
Other, net	(62)							(62)
Net Income (Loss) Attributable to Parent	$ 68,443
Balance — (in shares) at Sep. 30, 2019	176,793,000	176,793			46,053,000
Balance — at Sep. 30, 2019	$ 1,769,804	$ 220,991	$ 499,930	$ 3,651,126	$ (2,042,140)	$ 8,277	$ (593,849)	$ 25,469