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Business Segments: (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Details of reportable segment          
Total operating revenues $ 123,806 $ 132,975 $ 329,287 $ 348,526  
Operating income (loss) 39,617 41,185 92,624 96,605  
Interest expense, net 5,524 5,366 16,388 15,907  
Utility plant 1,128,588 1,032,119 1,128,588 1,032,119 $ 1,060,794
Depreciation and amortization expense 9,486 10,512 28,878 31,596  
Income tax expense (benefit) 12,708 14,394 28,577 31,826  
Capital additions 34,573 25,641 $ 99,907 59,848  
GSWC          
Details of reportable segment          
Number of reportable segments | segment     2    
Total operating revenues 98,763 105,219 $ 264,407 283,162  
Operating income (loss) 34,142 34,081 81,342 83,789  
Utility plant 1,122,928   1,122,928   $ 1,056,116
Depreciation and amortization expense 9,240 10,241 28,117 30,717  
Income tax expense (benefit) 11,041 12,109 $ 25,203 28,156  
AWR          
Details of reportable segment          
Number of reportable segments | segment     3    
Reportable Legal Entities | GSWC | Water          
Details of reportable segment          
Total operating revenues 90,617 97,273 $ 237,987 256,358  
Operating income (loss) 32,642 33,178 76,502 79,391  
Interest expense, net 5,145 5,117 15,272 15,026  
Utility plant 1,068,048 977,549 1,068,048 977,549  
Depreciation and amortization expense 8,734 9,773 26,597 29,482  
Income tax expense (benefit) 10,575 11,819 23,528 26,550  
Capital additions 32,655 22,608 93,189 52,770  
Reportable Legal Entities | GSWC | Electric          
Details of reportable segment          
Total operating revenues 8,146 7,946 26,420 26,804  
Operating income (loss) 1,500 903 4,840 4,398  
Interest expense, net 328 267 997 891  
Utility plant 54,880 50,294 54,880 50,294  
Depreciation and amortization expense 506 468 1,520 1,235  
Income tax expense (benefit) 466 290 1,675 1,606  
Capital additions 1,290 2,881 4,972 6,560  
Reportable Legal Entities | ASUS | Contracts          
Details of reportable segment          
Total operating revenues 25,043 27,756 64,880 65,364  
Operating income (loss) 5,487 7,108 11,298 12,825  
Interest expense, net 12 7 29 23  
Utility plant 5,660 4,276 5,660 4,276  
Depreciation and amortization expense 246 271 761 879  
Income tax expense (benefit) 1,951 2,590 4,029 4,349  
Capital additions 628 152 1,746 518  
Intersegment Eliminations | AWR          
Details of reportable segment          
Total operating revenues 0 0 0 0  
Operating income (loss) (12) (4) (16) (9)  
Interest expense, net 39 (25) 90 (33)  
Utility plant 0 0 0 0  
Depreciation and amortization expense 0 0 0 0  
Income tax expense (benefit) (284) (305) (655) (679)  
Capital additions $ 0 $ 0 $ 0 $ 0