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Long-Term Debt 3 (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2009
Debt Instrument [Line Items]              
Loan proceeds received for reimbursement of costs of conversion   $ 0 $ 159,413,000 $ 0      
3.45% notes due 2029              
Debt Instrument [Line Items]              
Interest rate (as a percent)   3.45% 3.45%        
9.56% notes due 2031              
Debt Instrument [Line Items]              
Interest rate (as a percent)   9.56% 9.56%        
GSWC              
Debt Instrument [Line Items]              
Ratio of Indebtedness to EBITDA   3.2          
Loan proceeds received for reimbursement of costs of conversion   $ 0 $ 159,413,000 $ 0      
GSWC | Maximum              
Debt Instrument [Line Items]              
Ratio of Indebtedness to EBITDA   8          
GSWC | 3.45% notes due 2029              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 15,000,000          
Interest rate (as a percent)   3.45% 3.45%        
GSWC | American Recovery and Reinvestment Act Obligation due 2033              
Debt Instrument [Line Items]              
Maximum borrowing capacity             $ 9,000,000
Interest rate (as a percent)           2.50%  
Maturity term         20 years    
Loan proceeds received for reimbursement of costs of conversion $ 8,600,000            
GSWC | 9.56% notes due 2031              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 28,000,000          
Interest rate (as a percent)   9.56% 9.56%