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Long-Term Indebtedness (Narrative) (Details)
6 Months Ended
Jun. 30, 2023
USD ($)
Dec. 07, 2021
USD ($)
May 13, 2021
USD ($)
tradingDay
Dec. 19, 2019
Mar. 29, 2019
USD ($)
Dec. 14, 2018
USD ($)
Apr. 27, 2016
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 24, 2014
USD ($)
Line of Credit Facility                    
Long-term indebtedness $ 915,756,000             $ 915,756,000 $ 1,095,888,000  
Level 1                    
Line of Credit Facility                    
Convertible debt, fair value $ 443,900,000             443,900,000    
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 0.0061469                  
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 $ 4,600,000             $ 4,600,000    
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         $ 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        
Remaining availability under the facilities $ 270,000,000             $ 270,000,000    
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | 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%