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Debt Part 2 (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 18, 2017
Apr. 04, 2017
Line of Credit Facility          
Line of Credit Facility, Covenant Terms The 2017 Credit Agreement contains customary representations, warranties and covenants, including, but not limited to, covenants restricting the company’s ability to incur indebtedness and liens and merge or consolidate with another entity. The 2017 Credit Agreement also contains financial covenants, requiring us to maintain a ratio of consolidated total indebtedness to consolidated earnings before income, taxes, depreciation and amortization, subject to certain adjustments ("Adjusted EBITDA") of not greater than 4.25 to 1, as well as requiring us to maintain a ratio of consolidated Adjusted EBITDA to consolidated interest expense of no less than 3.50 to 1 for the quarter ended September 30, 2017. The 2017 Credit Agreement also contains a financial covenant requiring us to maintain a senior secured net indebtedness to Adjusted EBITDA ratio of not greater than 3.50 to 1. These financial covenants may restrict our ability to pay dividends and purchase outstanding shares of our common stock. We were in compliance with our financial covenants at September 30, 2017. We will be required to repay the senior credit agreement with 25% to 50% of our excess cash flow from the preceding fiscal year, as defined in the agreement, unless our net leverage ratio for such preceding fiscal year is less than or equal to 3.00 to 1, which will be first measured using our fiscal year ended December 31, 2018.        
Covenant restriction, Maximum indebtedness to EBITDA   3.25 to 1      
Covenant restriction, Minimum EBITDA to interest expense   3.50 to 1      
Weighted average interest rate at end of period 5.00%        
Credit facility borrowings, Long-Term          
Line of Credit Facility          
Outstanding Borrowings $ 75,000        
Revolving Credit Facility [Member]          
Line of Credit Facility          
Outstanding Borrowings $ 20,000        
Bonds          
Line of Credit Facility          
Debt Instrument, Maturity Date May 01, 2025        
Face amount       $ 300,000  
Interest rate, stated percentage 5.625%     5.625%  
JPMorgan, 2017 Credit Agreement [Member]          
Line of Credit Facility          
Line of Credit Facility, Initiation Date Apr. 04, 2017        
Expiration date Apr. 04, 2022        
JPMorgan, 2017 Credit Agreement [Member] | Credit facility borrowings, Long-Term          
Line of Credit Facility          
Line of Credit Facility, Current Borrowing Capacity $ 400,000        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 1.25%        
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings 2.25%        
Face amount       $ 300,000  
JPMorgan, 2017 Credit Agreement [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility          
Line of Credit Facility, Current Borrowing Capacity $ 200,000        
Additional borrowing capacity available $ 150,000        
Minimum commitment fee percentage 0.175%        
Maximum commitment fee percentage 0.35%        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 1.075%        
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings 1.90%        
JP Morgan, Amended and Restated Credit Agreement [Member]          
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 (in hundreths)   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     $ 45,000
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 (in hundreths)   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      
Repayments of Long-term Debt $ 11,143        
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