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Long-Term Indebtedness (Narrative) (Details)
3 Months Ended
Dec. 07, 2021
USD ($)
May 13, 2021
USD ($)
tradingDay
Dec. 19, 2019
Mar. 29, 2019
USD ($)
Dec. 14, 2018
USD ($)
Apr. 27, 2016
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 24, 2014
USD ($)
Line of Credit Facility                  
Long-term indebtedness             $ 1,055,625,000 $ 1,095,888,000  
Level 1                  
Line of Credit Facility                  
Convertible debt, fair value             414,000,000    
Term Loan                  
Line of Credit Facility                  
Debt, face amount $ 400,000,000                
Term Loan | Period one                  
Line of Credit Facility                  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 1.25%                
Debt term     2 years            
Term Loan | Period two                  
Line of Credit Facility                  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 1.875%                
Term Loan | Period three                  
Line of Credit Facility                  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 2.50%                
Convertible Notes                  
Line of Credit Facility                  
Debt, face amount   $ 460,000,000              
Stated interest rate   1.125%              
Proceeds from issuance of convertible notes   $ 447,800,000              
Debt, conversion ratio   0.0060369              
Redemption price, percentage   100.00%              
Amount of principal held   25.00%              
Convertible Notes | Period one                  
Line of Credit Facility                  
Threshold trading days | tradingDay   20              
Threshold consecutive trading days | tradingDay   30              
Threshold percentage of stock price trigger   130.00%              
Convertible Notes | Period two                  
Line of Credit Facility                  
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             4,600,000    
Remaining availability under the facilities             $ 318,200,000    
Commitment fee percentage             0.175%    
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      
Prudential Investment Management Inc | Line of Credit                  
Line of Credit Facility                  
Long-term indebtedness       $ 50,000,000 $ 400,000,000        
Remaining availability under the facilities                 $ 150,000,000
Debt term       3 years          
Interest rate during period       3.80%          
Prudential Investment Management Inc | Line of Credit | New Term Loan, Amendment No. 4                  
Line of Credit Facility                  
Long-term indebtedness $ 400,000,000                
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        
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                  
Line of Credit Facility                  
Debt instrument, additional margin interest rate             0.125%    
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%      
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 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                  
Basis spread on variable rate             1.125%    
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                  
Basis spread on variable 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                  
Debt instrument, additional margin interest rate         1.625%