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Long-Term Debt (Narrative) (Details) - Credit Agreement [Member] - USD ($)
9 Months Ended
Oct. 22, 2024
Apr. 26, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]          
Line of credit outstanding amount     $ 511,500,000    
Capital One, National Association [Member]          
Debt Instrument [Line Items]          
Maximum aggregate loan amount available     503,500,000    
Debt instrument variable interest rate margin   1.00%      
Debt instrument total net leverage ratio   4.25%      
Line of credit outstanding amount     8,000,000    
Capital One, National Association [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt instrument total net leverage ratio   3.75%      
Capital One, National Association [Member] | Federal Funds Rate [Member]          
Debt Instrument [Line Items]          
Debt instrument variable interest rate margin   0.50%      
Capital One, National Association [Member] | One-Month Secured Overnight Financing Rate (SOFR) [Member]          
Debt Instrument [Line Items]          
Debt instrument variable interest rate margin   0.10%      
Capital One, National Association [Member] | One-Month Secured Overnight Financing Rate (SOFR) [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt instrument variable interest rate margin   0.00%      
Capital One, National Association [Member] | Based On Applicable Senior Leverage Ratio [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt instrument variable interest rate margin   0.75%      
Capital One, National Association [Member] | Based On Applicable Senior Leverage Ratio [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt instrument variable interest rate margin   1.50%      
Capital One, National Association [Member] | Based On Applicable Leverage Ratio [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt instrument variable interest rate margin   1.75%      
Capital One, National Association [Member] | Based On Applicable Leverage Ratio [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt instrument variable interest rate margin   2.50%      
Capital One, National Association [Member] | Restriction on Dividends [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Aggregate amount of dividends and distributions     7,500,000    
Capital One, National Association [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Maximum aggregate loan amount available $ 650,000,000        
Debt instrument, maturity date Jul. 30, 2028        
Revolving Credit Loan [Member] | Capital One, National Association [Member]          
Debt Instrument [Line Items]          
Proceeds from line of credit     0    
Repayments of line of credit       $ 78,500,000  
Line of credit outstanding amount     $ 0   $ 126,400,000
Debt instrument stated interest rate         7.21%
Revolving Credit Loan [Member] | Capital One, National Association [Member] | Tennessee Quality Care [Member]          
Debt Instrument [Line Items]          
Proceeds from line of credit       $ 110,000,000  
Revolving Credit Loan [Member] | Capital One, National Association [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Fee charged on unused portion of revolving credit facility     0.20%    
Revolving Credit Loan [Member] | Capital One, National Association [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Fee charged on unused portion of revolving credit facility     0.35%    
Revolving Credit Loan [Member] | Capital One, National Association [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Maximum aggregate loan amount available $ 650,000,000        
Incremental Loan Facility [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Maximum aggregate loan amount available $ 150,000,000