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Business Segments: (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Details of reportable segment          
Total operating revenues $ 124,418 $ 123,806 $ 336,423 $ 329,287  
Operating income (loss) 38,567 39,617 105,121 92,624  
Interest expense, net 5,454 5,524 16,406 16,388  
Utility plant 1,181,616 1,128,588 1,181,616 1,128,588 $ 1,150,926
Depreciation and amortization expense 9,854 9,486 29,184 28,878  
Income tax expense (benefit) 12,508 12,708 33,670 28,577  
Capital additions 32,000 34,573 $ 77,896 99,907  
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 99,913 98,763 $ 265,165 264,407  
Operating income (loss) 33,068 34,142 90,224 81,342  
Utility plant 1,175,343   1,175,343   $ 1,145,311
Depreciation and amortization expense 9,509 9,240 28,341 28,117  
Income tax expense (benefit) $ 10,813 11,041 $ 29,235 25,203  
Fort Riley [Member]          
Details of reportable segment          
Period of Transition to Operate and Maintain Water Systems at New Military Base 9 months        
Fort Riley [Member] | Contracts          
Details of reportable segment          
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases     50 years    
ASUS          
Details of reportable segment          
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases 50 years        
ASUS | Contracts          
Details of reportable segment          
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases     50 years    
Reportable Legal Entities | GSWC | Water Service Utility Operations          
Details of reportable segment          
Total operating revenues $ 91,919 90,617 $ 239,057 237,987  
Operating income (loss) 31,473   84,289    
Interest expense, net 4,974 5,145 14,924 15,272  
Utility plant 1,117,674 1,068,048 1,117,674 1,068,048  
Depreciation and amortization expense 8,972   26,731    
Income tax expense (benefit) 10,544   27,739    
Capital additions 30,536 32,655 74,113 93,189  
Reportable Legal Entities | GSWC | Electric          
Details of reportable segment          
Total operating revenues 7,994 8,146 26,108 26,420  
Operating income (loss) 1,595   5,935    
Interest expense, net 346 328 1,071    
Utility plant 57,669 54,880 57,669 54,880  
Depreciation and amortization expense 537   1,610    
Income tax expense (benefit) 269   1,496    
Capital additions 559 1,290 2,260 4,972  
Reportable Legal Entities | ASUS | Contracts          
Details of reportable segment          
Total operating revenues 24,505 25,043 71,258 64,880  
Operating income (loss) 5,502   14,907    
Interest expense, net 58   214    
Utility plant 6,273 5,660 6,273 5,660  
Depreciation and amortization expense 345   843    
Income tax expense (benefit) 1,944   5,152    
Capital additions 905 628 1,523 1,746  
Intersegment Eliminations | AWR          
Details of reportable segment          
Total operating revenues 0 0 0 0  
Operating income (loss) (3)   (10)    
Interest expense, net 76   197    
Utility plant 0 0 0 0  
Depreciation and amortization expense 0 0 0 0  
Income tax expense (benefit) (249)   (717)    
Capital additions $ 0 $ 0 $ 0 $ 0  
Minimum [Member] | Fort Riley [Member]          
Details of reportable segment          
Period of Transition to Operate and Maintain Water Systems at New Military Base 6 months        
Maximum [Member] | Fort Riley [Member]          
Details of reportable segment          
Period of Transition to Operate and Maintain Water Systems at New Military Base 12 months