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Debt Part 2 (Details)
€ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
USD ($)
Line of Credit Facility          
Payments of Short-term Debt $ 0 $ 1,500 $ 0    
JPMorgan Chase Bank, National Association, Amended and Restated Credit Agreement          
Line of Credit Facility          
Expiration date Jun. 30, 2020        
Line of Credit Facility, Current Borrowing Capacity         $ 125,000
Additional borrowing capacity available         62,500
Maximum borrowing capacity         187,500
Sublimit on borrowings by foreign subsidiaries         $ 100,000
Minimum commitment fee percentage 0.175%        
Maximum commitment fee percentage 0.30%        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings 1.075%        
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings 1.70%        
Interest rate spread added to the federal funds rate on Alternate Base Rate borrowings       0.50% 0.50%
Interest rate spread added to LIBOR rate for one month on Alternate Base Rate borrowings       1.00% 1.00%
Minimum interest rate spread added to LIBOR rate on Alternate Base Rate borrowings       0.075% 0.075%
Maximum interest rate spread added to LIBOR rate on Alternate Base Rate borrowings       0.70% 0.70%
Percentage collateral in stock of certain subsidiaries 65.00%        
Covenant restriction, Minimum EBITDA to interest expense 3.50 to 1        
Covenant restriction, maximum leverage after paying dividends or repurchasing stock, limit dividends 2.00 to 1        
Covenant restriction, Maximum leverage after paying dividends or repuchasing stock, no dividends 3.25 to 1        
Restriction on dividends and repurchases of common stock, Minimum $ 50,000        
Restriction on dividends and repurchases of common stock, Maximum $ 75,000        
Covenant restriction, Maximum leverage after acquisitions 3.00 to 1        
Covenant restriction, Maximum level that can be paid for acquisitions         $ 25,000
Weighted average interest rate at end of period       1.29% 1.29%
Outstanding Borrowings         $ 10,000
JP Morgan Chase Bank, National Association, The Credit Agreement          
Line of Credit Facility          
Minimum commitment fee percentage   0.20%      
Maximum commitment fee percentage   0.35%      
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings   1.30%      
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings   1.90%      
Interest rate spread added to the federal funds rate on Alternate Base Rate borrowings   0.50%      
Interest rate spread added to LIBOR rate for one month on Alternate Base Rate borrowings   1.00%      
Minimum interest rate spread added to LIBOR rate on Alternate Base Rate borrowings   0.30%      
Maximum interest rate spread added to LIBOR rate on Alternate Base Rate borrowings   0.90%      
Covenant restriction, Maximum leverage after acquisitions   2.75 to 1      
Prudential Investment Management, Inc. Private Shelf Agreement          
Line of Credit Facility          
Maximum borrowing capacity         80,000
Outstanding Borrowings         14,571
Second Amended Prudential Investment Management          
Line of Credit Facility          
Expiration date   Jul. 24, 2015      
Covenant restriction, Maximum indebtedness to EBITDA   3.00 to 1      
Covenant restriction, maximum leverage after paying dividends or repurchasing stock, limit dividends 2.00 to 1        
Restriction on dividends and repurchases of common stock, Minimum $ 50,000        
Restriction on dividends and repurchases of common stock, Maximum $ 75,000        
Covenant restriction, Maximum leverage after acquisitions   2.75 to 1      
Series A Notes          
Line of Credit Facility          
Face amount         $ 6,000
Interest rate, Stated percentage       4.00% 4.00%
Debt Instrument Term 7 years        
Maturity date range, Start Mar. 08, 2016        
Maturity date range, End Mar. 08, 2018        
Repayments of Long-term Debt $ 2,000 $ 2,000      
Series B Notes          
Line of Credit Facility          
Face amount         $ 8,571
Interest rate, Stated percentage       4.10% 4.10%
Debt Instrument Term 10 years        
Maturity date range, Start Jun. 28, 2016        
Maturity date range, End Jun. 28, 2021        
Repayments of Long-term Debt $ 1,429        
Third Amended Prudential Investment Management Agreement [Member]          
Line of Credit Facility          
Expiration date Jun. 30, 2018        
Covenant restriction, Maximum indebtedness to EBITDA 3.25 to 1        
Covenant restriction, Maximum leverage after paying dividends or repuchasing stock, no dividends 3.25 to 1        
Covenant restriction, Maximum leverage after acquisitions 3.00 to 1        
Covenant restriction, Maximum level that can be paid for acquisitions         $ 25,000
Royal Bank of Scotland Citizens, N.A.          
Line of Credit Facility          
Maximum borrowing capacity       € 2,000 2,173
Outstanding Borrowings         0
HSBC Bank (China) Company Limited, Shanghai Branch          
Line of Credit Facility          
Maximum borrowing capacity         5,000
Payments of Short-term Debt   $ 1,500      
Outstanding Borrowings         $ 0