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Long-Term Indebtedness (Narrative) (Details)
12 Months Ended
Dec. 07, 2021
USD ($)
May 13, 2021
USD ($)
tradingDay
Dec. 19, 2019
Mar. 29, 2019
USD ($)
Apr. 27, 2016
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 14, 2018
USD ($)
Feb. 24, 2014
USD ($)
Line of Credit Facility                    
Long-term indebtedness           $ 1,095,888,000 $ 1,231,959,000      
Long-term debt, net           1,118,974,000 1,302,962,000      
Proceeds from issuance of convertible notes           0 460,000,000 $ 0    
Level 1                    
Line of Credit Facility                    
Convertible Debt, Fair Value Disclosures           $ 388,700,000        
Term Loan                    
Line of Credit Facility                    
Face amount $ 400,000,000                  
Term Loan | Period One                    
Line of Credit Facility                    
Debt instrument term (in years)     2 years              
Term Loan | Period Two                    
Line of Credit Facility                    
Debt instrument term (in years)     2 years              
Term Loan | First Eight Quarters                    
Line of Credit Facility                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 1.25%                  
Term Loan | Next Eight Quarters                    
Line of Credit Facility                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 1.875%                  
Term Loan | Thereafter                    
Line of Credit Facility                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 2.50%                  
Convertible Debt                    
Line of Credit Facility                    
Face amount   $ 460,000,000                
Stated rate   1.125%                
Debt conversion ratio   0.0060369       0.0061133        
Conversion price | $ / shares           $ 165.65        
Debt Instrument, Redemption Price, Percentage   100.00%                
Proceeds from issuance of convertible notes   $ 447,800,000                
Debt Instrument, Redemption, Amount of Principal Held, Percent   25.00%                
Convertible Debt | Period One                    
Line of Credit Facility                    
Debt Instrument, Convertible, Threshold Trading Days | tradingDay   20                
Debt Instrument, Convertible, Threshold Consecutive Trading Days | tradingDay   30                
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%                
Convertible Debt | Period Two                    
Line of Credit Facility                    
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   98.00%                
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit                    
Line of Credit Facility                    
Letter of credit           $ 4,400,000 $ 27,800,000      
Remaining availability under the facilities           $ 306,500,000        
Commitment fee percentage           0.15%        
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Minimum                    
Line of Credit Facility                    
Commitment fee percentage           0.15%        
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Maximum                    
Line of Credit Facility                    
Commitment fee percentage           0.225%        
JPMorgan Chase Bank And Wells Fargo Bank | Letter of Credit                    
Line of Credit Facility                    
Maximum borrowings under line of credit         $ 50,000,000          
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  
Prudential Investment Management Inc | Line of Credit                    
Line of Credit Facility                    
Long-term indebtedness       $ 50,000,000         $ 250,000,000  
Remaining availability under the facilities                   $ 150,000,000
Weighted average interest rate       3.80%            
Debt instrument term (in years)       3 years            
Prudential Investment Management Inc | Line of Credit | New Term Loan, Amendment No. 4                    
Line of Credit Facility                    
Long-term indebtedness $ 400,000,000                  
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 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 additional margin interest rate           0.625%        
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                    
Line of Credit Facility                    
Interest rate           0.875%        
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 | Minimum                    
Line of Credit Facility                    
Interest rate           0.875%        
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                    
Interest rate           1.625%