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Long-Term Debt 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 13, 2023
Debt Instrument [Line Items]        
Ratio of Indebtedness to EBITDA 8      
Loan proceeds received for reimbursement of costs of conversion $ 34,789 $ 0 $ 159,413  
3.45% notes due 2029        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.45% 3.45%    
GSWC        
Debt Instrument [Line Items]        
Ratio of Indebtedness to EBITDA 4.2      
Maximum borrowing capacity $ 130,000      
Loan proceeds received for reimbursement of costs of conversion $ 0 $ 0 $ 159,413  
GSWC | 3.45% notes due 2029        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.45% 3.45%    
GSWC | Series A Senior Notes 5.12 Percent Due 2033 | Subsequent Event        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount       $ 100,000
Interest rate (as a percent)       5.12%