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Long-Term Indebtedness (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 07, 2021
USD ($)
May 13, 2021
USD ($)
tradingDay
Dec. 19, 2019
Dec. 14, 2018
USD ($)
Apr. 27, 2016
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Line of Credit Facility                  
Long-term indebtedness             $ 829,188,000 $ 829,188,000 $ 846,834,000
Level 1                  
Line of Credit Facility                  
Convertible debt, fair value             434,700,000 434,700,000  
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%              
Debt Instrument, Prepaid, Principal                 $ 37,500,000
Term Loan | Period two                  
Line of Credit Facility                  
Debt Instrument, Prepaid, Principal             15,000,000    
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 0.0061615                
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%            
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit                  
Line of Credit Facility                  
Letter of credit             4,800,000 $ 4,800,000  
Commitment fee percentage               0.225%  
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      
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              
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             $ 373,100,000 $ 373,100,000  
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                  
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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | 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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum                  
Line of Credit Facility                  
Debt instrument, 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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                  
Line of Credit Facility                  
Basis spread on variable rate               1.625%  
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | 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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum                  
Line of Credit Facility                  
Debt instrument, additional margin interest rate         1.875%