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Long-Term Debt (Narrative) (Details)
3 Months Ended
Dec. 08, 2022
debtCovenant
Jan. 24, 2019
USD ($)
Mar. 31, 2022
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
2022 Senior Credit Agreement | Applicable rate through March 31, 2023          
Debt Instrument [Line Items]          
Annual commitment fee (as a percentage) 0.20%        
2022 Senior Credit Agreement | Applicable rate through March 31, 2023 | Base Rate          
Debt Instrument [Line Items]          
Initial applicable margin 0.125%        
2022 Senior Credit Agreement | Applicable rate through March 31, 2023 | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Initial applicable margin 1.125%        
2022 Senior Credit Agreement | Applicable rate after April 1, 2023 | Base Rate | Minimum          
Debt Instrument [Line Items]          
Initial applicable margin 0.125%        
2022 Senior Credit Agreement | Applicable rate after April 1, 2023 | Base Rate | Maximum          
Debt Instrument [Line Items]          
Initial applicable margin 1.00%        
2022 Senior Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Number of debt covenants | debtCovenant 2        
Revolving credit facility | Line of Credit          
Debt Instrument [Line Items]          
Current borrowing capacity   $ 400,000,000      
Letters of credit issued   $ 700,000,000      
Revolving credit facility | Line of Credit | Minimum          
Debt Instrument [Line Items]          
Annual commitment fee   0.20% 0.15%    
Revolving credit facility | Line of Credit | Maximum          
Debt Instrument [Line Items]          
Annual commitment fee   0.25% 0.25%    
Revolving credit facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum          
Debt Instrument [Line Items]          
LIBOR floor, plus   1.125% 1.125%    
Revolving credit facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum          
Debt Instrument [Line Items]          
LIBOR floor, plus   2.00% 2.00%    
Revolving credit facility | Medium-term Notes          
Debt Instrument [Line Items]          
Term loan (up to)   $ 300,000,000      
Senior Credit Agreement | Standby Letters of Credit          
Debt Instrument [Line Items]          
Letters of credit issued       $ 4,300,000  
Senior Credit Agreement | Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving credit facility, availability amount       $ 343,700,000 $ 304,500,000