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Debt (Line of Credit Facility) (Details)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2012
JPMorgan Chase Bank, National Association [Member]
USD ($)
Sep. 30, 2012
Amended Prudential Investment Management [Member]
USD ($)
Sep. 30, 2012
Series A Notes [Member]
USD ($)
Sep. 30, 2012
Series B Notes [Member]
USD ($)
Sep. 30, 2012
Royal Bank of Scotland N.V. [Member]
USD ($)
Sep. 30, 2012
Royal Bank of Scotland N.V. [Member]
EUR (€)
Sep. 30, 2012
HSBC Bank (China) Company Limited, Shanghai Branch [Member]
USD ($)
Line of Credit Facility [Line Items]                
Line of credit facility, Maximum borrowing capacity   $ 125,000 $ 80,000     $ 2,576 € 2,000 $ 5,000
Amount of additional line of credit borrowing available   62,500            
Line of credit facility, Expanded Maximum borrowing capacity   187,500            
Line of credit facility, Amount outstanding   10,000 20,000          
Line of credit facility, weighted average interest rate at end of period (in hundredths)   1.75%            
Debt Instrument, Face Amount       10,000 10,000      
Debt Instrument, Interest Rate, Stated Percentage       4.00% 4.10%      
Debt Instrument, Payment Terms       7 year term 10 year term      
Debt Instrument, Maturity Date Range, Start       2014 2015      
Debt Instrument, Maturity Date Range, End       2018 2021      
Credit Facilities [Abstract]                
Line of credit facility, Expiration date   May 5, 2016 July 24, 2015          
Sublimit on borrowings by foreign subsidiaries   100,000            
Line of credit facility, Minimum commitment fee percentage (in hundredths)   0.25%            
Line of credit facility, Maximum commitment fee percentage (in hundredths)   0.40%            
Interest rate spread added to federal funds rate (in hundredths)   0.50%            
Interest rate spread added to LIBOR rate for one month (in hundredths)   1.00%            
Minimum interest rate spread added to LIBOR rate for one month based on leverage ratio (in hundredths)   0.50%            
Maximum interest rate spread added to LIBOR rate for one month based on leverage ratio (in hundredths)   1.10%            
Percentage stock of certain first tier foreign subsidiaries pledged as collateral under the credit agreement (in hundredths)   65.00%            
Line of credit facility, Covenant restriction, Maximum Indebtedness to EBITDA   3.00 to 1 3.00 to 1          
Line of credit facility, Covenant restriction, Minimum EBITDA to interest expense   3.50 to 1            
Line of credit facility, Covenant restriction, Maximum leverage ratio restricting paying of dividends or repurchasing stock   2.00 to 1 2.00 to 1          
Restriction on dividends and repurchases of common stock, Minimum   50,000 50,000          
Restriction on dividends and repurchases of common stock, Maximum   75,000 75,000          
Line of credit facility, Covenant restriction, Minimum leverage ratio restricting ability to make acquisitions   2.75 to 1 2.75 to 1          
Line of credit facility, Covenant restriction, Maximum level that can be paid for acquisitions   25,000 25,000          
Original Debt Amount Owed To Previous Owners Of An Acquired Business 1,500              
Amount outstanding on notes payable to owners of acquired entity $ 750