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Business Segments: (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Details of reportable segment          
Total operating revenues $ 111,954 $ 114,618 $ 205,481 $ 215,551  
Operating income (loss) 31,774 30,530 53,007 55,420  
Interest expense, net 5,413 5,425 10,864 10,541  
Utility plant 1,107,137 1,015,507 1,107,137 1,015,507 $ 1,060,794
Depreciation and amortization expense 9,601 10,536 19,392 21,084  
Income tax expense (benefit) 10,056 9,534 15,869 17,432  
Capital additions 35,880 16,817 $ 65,334 34,207  
GSWC          
Details of reportable segment          
Number of reportable segments | segment     2    
Total operating revenues 88,759 95,470 $ 165,644 177,943  
Operating income (loss) 27,557 27,235 47,200 49,708  
Utility plant 1,101,861   1,101,861   $ 1,056,116
Depreciation and amortization expense 9,347 10,235 18,877 20,476  
Income tax expense (benefit) 8,722 8,800 $ 14,162 16,047  
AWR          
Details of reportable segment          
Number of reportable segments | segment     3    
Reportable Legal Entities | GSWC | Water          
Details of reportable segment          
Total operating revenues 81,058 87,581 $ 147,370 159,085  
Operating income (loss) 26,452 26,472 43,860 46,213  
Interest expense, net 5,052 5,108 10,127 9,909  
Utility plant 1,048,127 963,147 1,048,127 963,147  
Depreciation and amortization expense 8,840 9,768 17,863 19,709  
Income tax expense (benefit) 8,367 8,587 12,953 14,731  
Capital additions 32,393 13,918 60,534 30,162  
Reportable Legal Entities | GSWC | Electric          
Details of reportable segment          
Total operating revenues 7,701 7,889 18,274 18,858  
Operating income (loss) 1,105 763 3,340 3,495  
Interest expense, net 344 311 669 624  
Utility plant 53,734 47,961 53,734 47,961  
Depreciation and amortization expense 507 467 1,014 767  
Income tax expense (benefit) 355 213 1,209 1,316  
Capital additions 2,862 2,605 3,682 3,679  
Reportable Legal Entities | ASUS | Contracts          
Details of reportable segment          
Total operating revenues 23,195 19,148 39,837 37,608  
Operating income (loss) 4,219 3,297 5,811 5,717  
Interest expense, net 10 8 17 16  
Utility plant 5,276 4,399 5,276 4,399  
Depreciation and amortization expense 254 301 515 608  
Income tax expense (benefit) 1,505 888 2,078 1,759  
Capital additions 625 294 1,118 366  
Intersegment Eliminations | AWR          
Details of reportable segment          
Total operating revenues 0 0 0 0  
Operating income (loss) (2) (2) (4) (5)  
Interest expense, net 7 (2) 51 (8)  
Utility plant 0 0 0 0  
Depreciation and amortization expense 0 0 0 0  
Income tax expense (benefit) (171) (154) (371) (374)  
Capital additions $ 0 $ 0 $ 0 $ 0