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Business Segments: (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Details of reportable segment          
Total operating revenues $ 113,195 $ 111,954 $ 212,005 $ 205,481  
Operating income (loss) 41,816 31,774 66,554 53,007  
Interest expense, net 5,306 5,413 10,952 10,864  
Utility plant 1,155,203 1,107,137 1,155,203 1,107,137 $ 1,150,926
Depreciation and amortization expense 9,647 9,601 19,330 19,392  
Income tax expense (benefit) 14,307 10,056 21,162 15,869  
Capital additions 21,902 35,880 $ 45,896 65,334  
AWR          
Details of reportable segment          
Number of reportable segments | segment     3    
GSWC          
Details of reportable segment          
Number of reportable segments | segment     2    
Total operating revenues 88,346 88,759 $ 165,252 165,644  
Operating income (loss) 35,079 27,557 57,156 47,200  
Utility plant 1,149,475   1,149,475   $ 1,145,311
Depreciation and amortization expense 9,394 9,347 18,832 18,877  
Income tax expense (benefit) 12,149 8,722 18,422 14,162  
Reportable Legal Entities | GSWC | Water Service Utility Operations          
Details of reportable segment          
Total operating revenues 80,734 81,058 147,138 147,370  
Operating income (loss) 33,552 26,452 52,816 43,860  
Interest expense, net 4,805 5,052 9,950 10,127  
Utility plant 1,093,104 1,048,127 1,093,104 1,048,127  
Depreciation and amortization expense 8,858 8,840 17,759 17,863  
Income tax expense (benefit) 11,710 8,367 17,195 12,953  
Capital additions 20,593 32,393 43,577 60,534  
Reportable Legal Entities | GSWC | Electric          
Details of reportable segment          
Total operating revenues 7,612 7,701 18,114 18,274  
Operating income (loss) 1,527 1,105 4,340 3,340  
Interest expense, net 350 344 725 669  
Utility plant 56,371 53,734 56,371 53,734  
Depreciation and amortization expense 536 507 1,073 1,014  
Income tax expense (benefit) 439 355 1,227 1,209  
Capital additions 978 2,862 1,701 3,682  
Reportable Legal Entities | ASUS | Contracts          
Details of reportable segment          
Total operating revenues 24,849 23,195 46,753 39,837  
Operating income (loss) 6,740 4,219 9,405 5,811  
Interest expense, net 82 10 156 17  
Utility plant 5,728 5,276 5,728 5,276  
Depreciation and amortization expense 253 254 498 515  
Income tax expense (benefit) 2,347 1,505 3,208 2,078  
Capital additions 331 625 618 1,118  
Intersegment Eliminations | AWR          
Details of reportable segment          
Total operating revenues 0 0 0 0  
Operating income (loss) (3) (2) (7) (4)  
Interest expense, net 69 7 121 51  
Utility plant 0 0 0 0  
Depreciation and amortization expense 0 0 0 0  
Income tax expense (benefit) (189) (171) (468) (371)  
Capital additions $ 0 $ 0 $ 0 $ 0