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Long-Term Debt 2 (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Annual maturities of all long-term debt, including capitalized leases    
Total $ 324,978 $ 325,265
GSWC    
Annual maturities of all long-term debt, including capitalized leases    
2019 40,320  
2020 345  
2021 365  
2022 390  
2023 404  
Thereafter 283,154  
Total $ 324,978 $ 325,265