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Long-Term Indebtedness (Narrative) (Details)
12 Months Ended
Dec. 07, 2021
USD ($)
May 13, 2021
USD ($)
tradingDay
Dec. 19, 2019
Apr. 27, 2016
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
Dec. 14, 2018
USD ($)
Line of Credit Facility              
Long-term indebtedness         $ 756,830,000 $ 846,834,000  
Long-term debt, net         757,253,000 847,423,000  
Level 1              
Line of Credit Facility              
Convertible Debt, Fair Value Disclosures         453,100,000    
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%            
Debt Instrument, Prepaid, Principal         $ 35,000,000 37,500,000  
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     0.0062482    
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%          
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit              
Line of Credit Facility              
Letter of credit         $ 4,800,000 $ 4,700,000  
Commitment fee percentage         0.20%    
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         0.275%    
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
Remaining availability under the facilities         $ 452,500,000    
Prudential Investment Management Inc | Line of Credit              
Line of Credit Facility              
Long-term indebtedness             $ 400,000,000
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 | Minimum              
Line of Credit Facility              
Debt additional margin interest rate       0.00% 0.375%    
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Maximum              
Line of Credit Facility              
Debt additional margin 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              
Line of Credit Facility              
Interest rate         1.375%    
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | 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 | Maximum              
Line of Credit Facility              
Interest rate         1.875%