Segment Information (Summary Of Revenues And Property, Plant And Equipment By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Revenues	$ 613,675	[1]	$ 614,682	$ 610,693	$ 531,853	$ 529,972	[2]	$ 493,449	$ 449,519	$ 422,164	$ 2,370,903	$ 1,895,104	$ 1,778,145
Property, Plant and Equipment	290,912					286,563					290,912	286,563	306,235
United States
Segment Reporting Information [Line Items]
Revenues											918,738	654,461	574,249
Property, Plant and Equipment	110,780					99,214					110,780	99,214	99,873
Canada
Segment Reporting Information [Line Items]
Revenues											69,782	71,122	45,056
Property, Plant and Equipment	514					620					514	620	747
Other North America
Segment Reporting Information [Line Items]
Revenues											26,500	22,964	13,734
Property, Plant and Equipment	139										139
North America
Segment Reporting Information [Line Items]
Revenues											1,015,020	748,547	633,039
Property, Plant and Equipment	111,433					99,834					111,433	99,834	100,620
Germany
Segment Reporting Information [Line Items]
Revenues											229,815	194,636	197,020
Property, Plant and Equipment	61,527					71,159					61,527	71,159	83,004
United Kingdom
Segment Reporting Information [Line Items]
Revenues											109,771	106,782	109,523
Property, Plant and Equipment	40,249					45,764					40,249	45,764	48,871
France
Segment Reporting Information [Line Items]
Revenues											81,262	68,361	75,152
Property, Plant and Equipment	6,519					7,006					6,519	7,006	7,288
Other Europe
Segment Reporting Information [Line Items]
Revenues											319,450	290,378	305,991
Property, Plant and Equipment	37,261					22,399					37,261	22,399	25,712
Europe
Segment Reporting Information [Line Items]
Revenues											740,298	660,157	687,686
Property, Plant and Equipment	145,556					146,328					145,556	146,328	164,875
China
Segment Reporting Information [Line Items]
Revenues											194,060	158,150	130,290
Property, Plant and Equipment	20,138					23,407					20,138	23,407	22,846
Other Asia
Segment Reporting Information [Line Items]
Revenues											211,798	153,031	157,093
Property, Plant and Equipment	477					613					477	613	519
Asia
Segment Reporting Information [Line Items]
Revenues											405,858	311,181	287,383
Property, Plant and Equipment	20,615					24,020					20,615	24,020	23,365
Brazil
Segment Reporting Information [Line Items]
Revenues											50,040	33,401	39,405
Property, Plant and Equipment	8,147					9,931					8,147	9,931	10,335
Other South America
Segment Reporting Information [Line Items]
Revenues											19,902	17,068	22,396
South America
Segment Reporting Information [Line Items]
Revenues											69,942	50,469	61,801
Property, Plant and Equipment	8,147					9,931					8,147	9,931	10,335
Africa And Australia
Segment Reporting Information [Line Items]
Revenues											139,785	124,750	108,236
Property, Plant and Equipment	$ 5,161					$ 6,450					$ 5,161	$ 6,450	$ 7,040

[1] Results for the quarter ended December 31, 2011 reflect corporate relocation and acquisition due diligence costs totaling $0.6 million ($0.4 million after income taxes) and a net foreign currency gain of $3.4 million related to the financing of the Robuschi acquisition.

[2] Results for the quarter ended December 31, 2010 reflect corporate relocation and acquisition due diligence costs totaling $4.8 million ($3.7 million after income taxes).