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Long-term Debt (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Line of Credit Facility [Line Items]    
Current borrowing capacity $ 650,000 $ 500,000
Maximum borrowing capacity $ 700,000  
Percentage Of Subsidiary Stock Securing Debt 0.65  
Long-term debt $ 369,400 $ 369,400
Letters of Credit Outstanding, Amount 1,000  
Line of Credit Facility, Remaining Borrowing Capacity $ 279,600  
Applicable Margin Federal Funds Rate 0.50%  
Adjusted Term SOFR Rate Plus Applicable Margin 2.00%  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%  
Line of Credit Facility, Interest Rate During Period 2.20%  
Base Rate [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.00%  
Base Rate [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.50%  
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.50%  
Adjusted Term SOFR rate 10.00%  
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 2.25%  
Adjusted Term SOFR rate 25.00%