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Debt (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2023
May 18, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Outstanding long-term debt current $ 39,996,000   $ 39,979,000
Long-term principal 1,000,000,000    
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding 700,000    
Maximum borrowing capacity   $ 75,000,000  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving line of credit borrowings $ 0    
Debt instrument, maturity date Feb. 14, 2027    
Maximum borrowing capacity   300,000,000  
Amount available to increase borrowing capacity   500,000,000  
Swing Line Loans [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 25,000,000  
Amended Term Loan Agreement [Member]      
Debt Instrument [Line Items]      
Outstanding long-term debt current $ 40,000,000    
Term loan maturity period 2023-12    
Line of credit facility, amount outstanding $ 971,000,000    
Secured Overnight Financing Rate (SOFR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.66%    
Secured Overnight Financing Rate (SOFR) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.30%