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Debt Line of Credit Facility (Details)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
JPMorgan Chase Bank, National Association
USD ($)
Dec. 31, 2012
Amended Prudential Investment Management
USD ($)
Dec. 31, 2012
Series A Notes
USD ($)
Dec. 31, 2012
Series B Notes
USD ($)
Dec. 31, 2012
Royal Bank of Scotland Citizens, N.A.
USD ($)
Dec. 31, 2012
Royal Bank of Scotland Citizens, N.A.
EUR (€)
Dec. 31, 2012
HSBC Bank (China) Company Limited, Shanghai Branch
USD ($)
Line of Credit Facility                
Expiration date   May 05, 2016 Jul. 24, 2015          
Maximum borrowing capacity   $ 125,000       $ 2,640 € 2,000 $ 5,000
Additional borrowing capacity available   62,500            
Maximum borrowing capacity with additional borrowing   187,500            
Sublimit on borrowings by foreign subsidiaries   100,000            
Minimum commitment fee percentage   0.25%            
Maximum commitment fee percentage   0.40%            
Interest rate spread added to the federal funds rate   0.50%            
Interest rate spread added to LIBOR rate for one month   1.00%            
Minimum interest rate spread added to LIBOR rate   0.50%            
Maximum interest rate spread added to LIBOR rate   1.10%            
Percentage collateral in stocks   65.00%            
Covenant restriction, Maximum indebtedness to EBITDA   3.00 to 1 3.00 to 1          
Covenant restriction, Minimum EBITDA to interest expense   3.50 to 1            
Covenant restriction, Maximum leverage after paying dividends or repuchasing 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          
Covenant restriction, Maximum leverage after acquisitions   2.75 to 1 2.75 to 1          
Covenant restriction, Maximum level that can be paid for acquisitions   25,000 25,000          
Amount outstanding   10,000 20,000          
Weighted average interest rate at end of period   1.72%            
Face amount       10,000 10,000      
Interest rate, Stated percentage       4.00% 4.10%      
Payment Terms       7 year term 10 year term      
Maturity date range, Start       Jan. 01, 2014 Jan. 01, 2015      
Maturity date range, End       Jan. 01, 2018 Jan. 01, 2021      
Original debt amount owed to previous owners of an acquired business 1,500              
Amount Outstanding on notes payable to owners of acquired entity $ 750