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Debt Part 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility    
Covenant restriction, Maximum indebtedness to EBITDA 3.25 to 1  
Covenant restriction, Minimum EBITDA to interest expense 3.50 to 1  
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%  
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 0.075%  
Maximum interest rate spread added to LIBOR rate on Alternate Base Rate borrowings 0.70%  
Percentage collateral in stock of certain subsidiaries 65.00%  
Covenant restriction, Maximum indebtedness to EBITDA 3.25 to 1  
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 1.64%  
Outstanding Borrowings $ 25,000  
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 indebtedness to EBITDA 3.00 to 1  
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 $ 11,143  
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 $ 4,000  
Interest rate, Stated percentage 4.00%  
Debt Instrument Term 7 years  
Maturity date range, Start Mar. 08, 2017  
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 $ 7,143  
Interest rate, Stated percentage 4.10%  
Debt Instrument Term 10 years  
Maturity date range, Start Jun. 28, 2017  
Maturity date range, End Jun. 28, 2021  
Repayments of Long-term Debt $ 1,429 $ 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  
HSBC Bank (China) Company Limited, Shanghai Branch    
Line of Credit Facility    
Maximum borrowing capacity 5,000  
Outstanding Borrowings $ 0