v3.25.2
Debt (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jun. 30, 2024
Debt Instrument [Line Items]        
Long-term Debt $ 3,596,878   $ 3,595,628  
Maximum borrowing capacity 500,000      
Proceeds from Secured Lines of Credit   $ 300,000    
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid 300,000      
Unused lines of Credit        
Debt Instrument [Line Items]        
Proceeds from Secured Lines of Credit 100,000 $ 100,000    
$400M Term Loan        
Debt Instrument [Line Items]        
Short-Term Bank Loans and Notes Payable 400,000     $ 400,000
Subsidiaries [Member]        
Debt Instrument [Line Items]        
Long-term Debt 2,731,031   2,730,238  
Secured Debt 2,731,031   2,730,238  
Subsidiaries [Member] | FMB Twenty - four        
Debt Instrument [Line Items]        
Secured Debt $ 55,000   55,000  
Debt Instrument, Interest Rate, Stated Percentage 1.40%      
Subsidiaries [Member] | FMB Twenty - five        
Debt Instrument [Line Items]        
Secured Debt $ 40,000   40,000  
Debt Instrument, Interest Rate, Stated Percentage 0.65%      
Subsidiaries [Member] | FMB Twenty Seven        
Debt Instrument [Line Items]        
Secured Debt $ 650,000   650,000  
Debt Instrument, Interest Rate, Stated Percentage 5.70%      
Parent Company [Member] | Three Point Four Five Percent Senior Secured Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt $ 475,000   475,000  
Debt Instrument, Interest Rate, Stated Percentage 4.25%      
Line of Credit [Member] | Committed Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit, outstanding borrowings $ 0   $ 100,000