CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	Total	Comprehensive Income	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Common Stock Par Value	Treasury Stock	Capital in Excess of Par Value	Non-Controlling Interest
Balance at Dec. 31, 2008	$ 1,131,798		$ 1,065,998	$ 139,300	$ 801	$ (329,285)	$ 254,216	$ 768
Increase (Decrease) in Stockholders' Equity
Net income	124,597	124,597	124,623					(26)
Foreign currency translation adjustments	44,978	44,978		44,929				49
Changes in unrecognized pension gains/losses and related amortization, net of tax	1,790	1,790		1,790
Changes in treasury locks, net of tax	80	80		80
Comprehensive income		171,445
Stock option exercises & restricted stock vestings	20,968				5	2,708	18,255
Cash dividends declared on common stock	(40,604)		(40,604)
Treasury stock purchased	(29,971)					(29,971)
Balance at Dec. 31, 2009	1,253,636		1,150,017	186,099	806	(356,548)	272,471	791
Increase (Decrease) in Stockholders' Equity
Net income	173,589	173,589	173,481					108
Foreign currency translation adjustments	(56,741)	(56,741)		(56,693)				(48)
Changes in unrecognized pension gains/losses and related amortization, net of tax	(5,724)	(5,724)		(5,724)
Changes in treasury locks, net of tax	84	84		84
Comprehensive income		111,208
Stock option exercises & restricted stock vestings	45,888				11	2	45,875
Cash dividends declared on common stock	(44,485)		(44,485)
Treasury stock purchased	(86,473)					(86,473)
Balance at Dec. 31, 2010	1,279,774		1,279,013	123,766	817	(443,019)	318,346	851
Increase (Decrease) in Stockholders' Equity
Net income	183,630	183,630	183,683					(53)
Foreign currency translation adjustments	(47,411)	(47,411)		(47,436)				25
Changes in unrecognized pension gains/losses and related amortization, net of tax	(16,071)	(16,071)		(16,071)
Changes in treasury locks, net of tax	56	56		56
Net gain on Derivatives, net of tax	3	3		3
Comprehensive income		120,207
Stock option exercises & restricted stock vestings	46,521				10	2	46,509
Cash dividends declared on common stock	(53,308)		(53,308)
Non-controlling interests distribution	(27)							(27)
Treasury stock purchased	(102,595)					(102,595)
Balance at Dec. 31, 2011	$ 1,290,572		$ 1,409,388	$ 60,318	$ 827	$ (545,612)	$ 364,855	$ 796