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Business Segments: (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Details of reportable segment
Total operating revenues	$ 124,647	$ 106,901	$ 226,380	$ 201,629
Operating income (loss)	39,430	25,568	59,625	44,259
Interest expense, net	5,406	5,412	10,781	10,799
Utility plant	1,355,663	1,238,789	1,355,663	1,238,789	$ 1,296,310
Depreciation and amortization expense	6,655	10,010	17,487	19,676
Income tax expense (benefit)	7,831	4,387	11,141	6,951
Capital additions	40,593	28,418	$ 81,155	58,782
AWR
Details of reportable segment
Number of reportable segments | segment			3
GOLDEN STATE WATER COMPANY
Details of reportable segment
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment	96	61	$ 154	121
Number of reportable segments | segment			2
Total operating revenues	95,548	84,574	$ 170,900	158,818
Operating income (loss)	34,037	22,645	49,364	38,942
Utility plant	1,337,424		1,337,424		$ 1,281,092
Depreciation and amortization expense	6,006	9,430	15,995	18,764
Income tax expense (benefit)	6,826	4,214	8,946	6,329
GOLDEN STATE WATER COMPANY | Water Service Utility Operations
Details of reportable segment
Total operating revenues	88,140	76,733	152,863	141,145
GOLDEN STATE WATER COMPANY | Electric Service Utility Operations
Details of reportable segment
Total operating revenues	7,408	7,841	$ 18,037	17,673
ASUS | Contracted Services
Details of reportable segment
Period of fixed price contracts to operate and maintain water systems at various military bases			50 years
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Water Service Utility Operations
Details of reportable segment
Total operating revenues	88,140	76,733	$ 152,863	141,145
Operating income (loss)	33,259	21,244	46,525	35,302
Interest expense, net	5,112	5,047	10,349	10,056
Utility plant	1,273,962	1,166,867	1,273,962	1,166,867
Depreciation and amortization expense	5,405	8,866	14,794	17,635
Income tax expense (benefit)	6,812	3,909	8,485	5,558
Capital additions	36,293	24,768	74,672	51,386
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations
Details of reportable segment
Total operating revenues	7,408	7,841	18,037	17,673
Operating income (loss)	778	1,401	2,839	3,640
Interest expense, net	346	353	699	723
Utility plant	63,462	60,504	63,462	60,504
Depreciation and amortization expense	601	564	1,201	1,129
Income tax expense (benefit)	14	305	461	771
Capital additions	1,254	1,150	1,988	2,124
Reportable Legal Entities | ASUS | Contracted Services
Details of reportable segment
Total operating revenues	29,099	22,327	55,480	42,811
Operating income (loss)	5,395	2,925	10,265	5,322
Interest expense, net	(219)	71	(580)	137
Utility plant	18,239	11,418	18,239	11,418
Depreciation and amortization expense	649	580	1,492	912
Income tax expense (benefit)	1,300	705	2,425	1,259
Capital additions	3,046	2,500	4,495	5,272
Intersegment Eliminations | AWR
Details of reportable segment
Total operating revenues	0	0		0
Operating income (loss)	(2)	(2)	(4)	(5)
Interest expense, net	167	(83)	313	(157)
Utility plant	0	0	0	0
Depreciation and amortization expense	0	0	0	0
Income tax expense (benefit)	(295)	(532)	(230)	(637)
Capital additions	$ 0	$ 0	$ 0	$ 0

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