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Long-term Debt (Narrative) (Details) - Credit Agreement [Member] - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Credit facility, initiation date Sep. 18, 2018  
Credit facility, maximum borrowing capacity $ 100.0  
Credit facility, expiration date Sep. 18, 2023  
Credit facility, amount outstanding $ 5.0  
Credit facility, available borrowing capacity $ 92.6  
London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Credit facility effective interest rate 3.54%  
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Credit facility, spread on variable interest rate 1.50%  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Credit facility, spread on variable interest rate 2.25%  
Base Rate [Member]    
Debt Instrument [Line Items]    
Credit facility effective interest rate 5.50%  
Base Rate [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Credit facility, spread on variable interest rate 0.50%  
Base Rate [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Credit facility, spread on variable interest rate 1.25%  
Base Rate - Federal Funds [Member]    
Debt Instrument [Line Items]    
Credit facility, spread on variable interest rate 0.50%  
Base Rate - Eurodollar [Member]    
Debt Instrument [Line Items]    
Credit facility, spread on variable interest rate 1.00%  
Letter of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding $ 2.4 $ 2.4