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Long-Term Indebtedness (Narrative) (Details)
€ in Millions
6 Months Ended
Mar. 29, 2019
Dec. 14, 2018
USD ($)
Apr. 27, 2016
USD ($)
Mar. 20, 2015
USD ($)
Feb. 24, 2014
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Line of Credit Facility                
Long-term indebtedness           $ 245,310,000   $ 293,528,000
Borrowings           245,923,000   $ 294,124,000
Remaining availability under the facilities           $ 556,900,000    
Percentage of equity interests used as security           65.00%    
Amended Credit Agreement                
Line of Credit Facility                
Maximum borrowings under line of credit   $ 300,000,000.0            
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit                
Line of Credit Facility                
Maximum borrowings under line of credit     $ 325,000,000.0          
Long-term indebtedness   250,000,000.0            
Borrowings           $ 45,600,000 € 40.0  
Letter of credit           2,500,000    
Remaining availability under the facilities           $ 406,900,000    
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate                
Line of Credit Facility                
Basis spread on variable rate           1.00%    
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate | Minimum                
Line of Credit Facility                
Basis spread on variable rate           0.875%    
Prudential Investment Management Inc | Line of Credit                
Line of Credit Facility                
Long-term indebtedness       $ 50,000,000.0        
Remaining availability under the facilities         $ 150,000,000.0      
Debt term 3 years     5 years        
Interest rate during period 3.80%     3.35%        
Period after request is issued, by company, for interest payable rate to be determined by Prudential         5 days      
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit                
Line of Credit Facility                
Maximum borrowings under line of credit   $ 600,000,000.0            
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Minimum                
Line of Credit Facility                
Debt instrument, additional margin interest rate     0.00%     0.00%    
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum                
Line of Credit Facility                
Debt instrument, additional margin interest rate   0.625%            
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Federal Funds Effective Rate                
Line of Credit Facility                
Basis spread on variable rate   0.50%            
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum                
Line of Credit Facility                
Basis spread on variable rate   1.625%