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Debt (Line of Credit Facility) (Details)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2013
JPMorgan Chase Bank, National Association
USD ($)
Sep. 30, 2013
Amendment No. 1 to the 2011 Credit Agreement Effective April 25, 2013
Sep. 30, 2013
Amended Prudential Investment Management
USD ($)
Sep. 30, 2013
Series A Notes
USD ($)
Sep. 30, 2013
Series B Notes
USD ($)
Sep. 30, 2013
Royal Bank of Scotland N.V.
USD ($)
Sep. 30, 2013
Royal Bank of Scotland N.V.
EUR (€)
Sep. 30, 2013
HSBC Bank (China) Company Limited, Shanghai Branch
USD ($)
Line of Credit Facility                  
Line of credit facility, Maximum borrowing capacity   $ 125,000   $ 80,000     $ 2,706 € 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     0   1,500
Line of credit facility, weighted average interest rate at end of period (in hundredths)   1.49%              
Debt Instrument, Face Amount         10,000 10,000      
Debt Instrument, Interest Rate, Stated Percentage         4.00% 4.10%     4.40%
Debt Instrument, Payment Terms         7 year term 10 year term      
Debt Instrument, Maturity Date Range, Start         Jan. 01, 2014 Jan. 01, 2015      
Debt Instrument, Maturity Date Range, End         Jan. 01, 2018 Jan. 01, 2021      
Credit Facilities                  
Line of credit facility, Expiration date   May 05, 2016 Mar. 01, 2018 Jul. 24, 2015          
Sublimit on borrowings by foreign subsidiaries   100,000              
Line of credit facility, Minimum commitment fee percentage (in hundredths)   0.25% 0.20%            
Line of credit facility, Maximum commitment fee percentage (in hundredths)   0.40% 0.35%            
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths)   1.50% 1.30%            
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ration on Eurocurrency borrowings (in hundreths)   2.10% 1.90%            
Interest rate spread added to federal funds rate on Alternate Base Rate Borrowings (in hundredths)   0.50% 0.50%            
Interest rate spread added to LIBOR rate for one month on Alternate Base Rate Borrowings (in hundredths)   1.00% 1.00%            
Minimum interest rate spread added to LIBOR rate for one month based on leverage ratio on Alternate Base Rate Borrowings (in hundredths)   0.50% 0.30%            
Maximum interest rate spread added to LIBOR rate for one month based on leverage ratio on Alternate Base Rate Borrowings (in hundredths)   1.10% 0.90%            
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 $ 0