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Business Segments: (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Details of reportable segment      
Total operating revenues $ 93,527 $ 100,933  
Operating income (loss) 21,233 24,890  
Interest expense, net 5,451 5,116  
Utility plant 1,079,318 1,007,563 $ 1,060,794
Depreciation and amortization expense 9,791 10,548  
Income tax expense (benefit) 5,813 7,898  
Capital additions $ 29,454 17,390  
GSWC      
Details of reportable segment      
Number of reportable segments | segment 2    
Total operating revenues $ 76,885 82,473  
Operating income (loss) 19,643 22,473  
Utility plant 1,074,398   $ 1,056,116
Depreciation and amortization expense 9,530 10,241  
Income tax expense (benefit) 5,440 7,247  
Depreciation on transportation equipment $ 175 223  
AWR      
Details of reportable segment      
Number of reportable segments | segment 3    
Total operating revenues $ 0 0  
Operating income (loss) (2) (3)  
Interest expense, net 44 (6)  
Utility plant 0 0  
Depreciation and amortization expense 0 0  
Income tax expense (benefit) (200) (220)  
Capital additions 0 0  
Reportable Legal Entities [Member] | GSWC | Water      
Details of reportable segment      
Total operating revenues 66,312 71,504  
Operating income (loss) 17,408 19,741  
Interest expense, net 5,075 4,801  
Utility plant 1,022,525 958,270  
Depreciation and amortization expense 9,023 9,941  
Income tax expense (benefit) 4,586 6,144  
Capital additions 28,141 16,244  
Reportable Legal Entities [Member] | GSWC | Electric      
Details of reportable segment      
Total operating revenues 10,573 10,969  
Operating income (loss) 2,235 2,732  
Interest expense, net 325 313  
Utility plant 51,873 44,871  
Depreciation and amortization expense 507 300  
Income tax expense (benefit) 854 1,103  
Capital additions 820 1,074  
Reportable Legal Entities [Member] | ASUS | Contracts      
Details of reportable segment      
Total operating revenues 16,642 18,460  
Operating income (loss) 1,592 2,420  
Interest expense, net 7 8  
Utility plant 4,920 4,422  
Depreciation and amortization expense 261 307  
Income tax expense (benefit) 573 871  
Capital additions $ 493 $ 72