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Contractual Commitments and Contingencies (Letters Of Credit And Guarantees) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Maximum [Member]
Mar. 31, 2013
Revolving Credit Facility [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Mar. 14, 2012
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Mar. 31, 2013
Letters of Credit [Member]
Revolving Credit Facility [Member]
Mar. 31, 2013
Foreign Lines of Credit [Member]
Lettters Of Credit And Guarantees [Line Items]                  
Outstanding guarantees $ 14,000,000                
Outstanding letters of credit       3,100,000 3,100,000        
Maximum borrowing capacity under the revolving credit facility       650,000,000 650,000,000.0 650,000,000 300,000,000 100,000,000  
Maximum potential amount of future payments under all other guarantees not secured by letters of credit 21,000,000                
Draws on lines of credit                 $ 5,200,000
Letters of credit and certain guarantees, expiration date   2013 2021