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Fair Value Measurements (Quantitative Information Level 3 Measurements ) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Estimate of Fair Value Measurement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-term debt, fair value $ 567,500     $ 585,100 $ 585,200      
Level 3 | Convertible preferred securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Asset fair value 15,725 $ 15,625 $ 15,625 15,625 20,628 $ 15,424 $ 15,410 $ 16,278
Implied based on market prices | Level 3 | Convertible preferred securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Asset fair value $ 15,725     $ 15,625 $ 20,628