CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Common Stock Par Value	Treasury Stock	Capital in Excess of Par Value	Non-Controlling Interest	Total
Balance at Dec. 31, 2013	$ 1,619,419	$ 109,751	$ 853	$ (738,558)	$ 488,292	$ 551	$ 1,480,308
Increase (Decrease) in Stockholders' Equity
Net Income	191,658					(34)	191,624
Foreign currency translation adjustments		(192,816)				(8)	(192,824)
Changes in unrecognized pension gains/losses and related amortization, net of tax		(27,004)					(27,004)
Changes in treasury locks, net of tax		24					24
Stock option exercises & restricted stock vestings			9	2,958	60,410		63,377
Cash dividends declared on common stock	(71,072)						(71,072)
Treasury stock purchased				(290,517)	(50,000)		(340,517)
Balance at Dec. 31, 2014	1,740,005	(110,045)	862	(1,026,117)	498,702	509	1,103,916
Increase (Decrease) in Stockholders' Equity
Net Income	199,348					(53)	199,295
Foreign currency translation adjustments		(163,874)				(13)	(163,887)
Changes in unrecognized pension gains/losses and related amortization, net of tax		11,547					11,547
Changes in treasury locks, net of tax		25					25
Stock option exercises & restricted stock vestings			14	5,447	79,107		84,568
Cash dividends declared on common stock	(71,247)						(71,247)
Treasury stock purchased				(50,000)	50,000
Treasury stock retired	(669,801)		(207)	800,618	(130,610)
Common stock repurchased and retired	(12,624)		(2)		(1,261)		(13,887)
Non controlling interest repurchased					(476)	(148)	(624)
Balance at Dec. 31, 2015	1,185,681	(262,347)	667	(270,052)	495,462	295	1,149,706
Increase (Decrease) in Stockholders' Equity
Net Income	205,590					14	205,604
Foreign currency translation adjustments		(53,163)				(20)	(53,183)
Changes in unrecognized pension gains/losses and related amortization, net of tax		(4,225)					(4,225)
Changes in treasury locks, net of tax		26					26
Stock option exercises & restricted stock vestings			10	19,135	65,198		84,343
Cash dividends declared on common stock	(76,659)						(76,659)
Common stock repurchased and retired	(117,378)		(17)		(13,976)		(131,371)
Non controlling interest addition					(2)	3	1
Balance at Dec. 31, 2016	$ 1,197,234	$ (319,709)	$ 660	$ (250,917)	$ 546,682	$ 292	$ 1,174,242