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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Taxes and Interest Paid:      
Income taxes paid $ 14,817 $ 15,984 $ 10,880
Interest paid 21,822 22,236 22,144
Non-Cash Transactions:      
Accrued payables for investment in utility plant 20,655 13,147 19,515
Property installed by developers and conveyed 3,284 800 2,819
GSWC      
Taxes and Interest Paid:      
Income taxes paid 1,541 16,500 7,083
Interest paid 21,797 22,184 22,144
Non-Cash Transactions:      
Accrued payables for investment in utility plant 20,655 13,141 19,515
Property installed by developers and conveyed $ 3,284 $ 800 $ 2,819