CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Revenues
Water		$ 306,332	$ 302,931	$ 328,511
Electric		33,969	35,771	36,039
Contracted services		100,302	97,385	94,091
Total operating revenues		440,603	436,087	458,641
Operating Expenses
Water purchased		68,302	64,442	62,726
Power purchased for pumping		8,518	8,663	8,988
Groundwater production assessment		18,638	14,993	13,648
Power purchased for resale		10,720	10,387	10,395
Supply cost balancing accounts		(17,939)	(12,206)	7,785
Other operation		29,994	28,257	28,429
Administrative and general		81,662	80,994	79,817
Depreciation and amortization	[1]	39,031	38,850	42,033
Maintenance		15,176	16,470	16,885
Property and other taxes		17,905	16,801	16,636
Construction and Development Costs		49,838	53,720	52,810
Gain (Loss) on Sale of Assets and Asset Impairment Charges		(8,318)	0	0
Total operating expenses		313,527	321,371	340,152
Operating Income		127,076	114,716	118,489
Other Income and Expenses
Interest expense		(22,582)	(21,992)	(21,088)
Interest income		1,790	757	458
Other, net		2,057	997	356
Total other income and expenses		(18,735)	(20,238)	(20,274)
Income before income tax expense		108,341	94,478	98,215
Income tax expense		38,974	34,735	37,731
Net Income		$ 69,367	$ 59,743	$ 60,484
Basic Earnings Per Common Share
Income from continuing operations (in dollars per share)		$ 1.88	$ 1.63	$ 1.61
Net Income (in dollars per share)		1.88	1.63	1.61
Fully Diluted Earnings Per Share
Income from continuing operations (in dollars per share)		1.88	1.62	1.60
Net Income (in dollars per share)		$ 1.88	$ 1.62	$ 1.60
Weighted Average Number of Shares Outstanding (in shares)		36,638	36,552	37,389
Weighted Average Number of Diluted Shares (in shares)		36,844	36,750	37,614
Dividends Declared Per Common Share (in dollars per share)		$ 0.994	$ 0.914	$ 0.874
GSWC
Operating Revenues
Water		$ 306,332	$ 302,931	$ 328,511
Electric		33,969	35,771	36,039
Total operating revenues		340,301	338,702	364,550
Operating Expenses
Water purchased		68,302	64,442	62,726
Power purchased for pumping		8,518	8,663	8,988
Groundwater production assessment		18,638	14,993	13,648
Power purchased for resale		10,720	10,387	10,395
Supply cost balancing accounts		(17,939)	(12,206)	7,785
Other operation		24,877	24,771	24,892
Administrative and general		62,231	64,066	64,877
Depreciation and amortization		37,852	37,804	40,893
Maintenance		12,970	14,519	14,693
Property and other taxes		16,402	15,444	15,244
Gain (Loss) on Sale of Assets and Asset Impairment Charges		(8,318)	0	0
Total operating expenses		234,253	242,883	264,141
Operating Income		106,048	95,819	100,409
Other Income and Expenses
Interest expense		(22,055)	(21,782)	(20,998)
Interest income		1,766	749	440
Other, net		2,057	792	212
Total other income and expenses		(18,232)	(20,241)	(20,346)
Income before income tax expense		87,816	75,578	80,063
Income tax expense		34,059	28,609	32,472
Net Income		$ 53,757	$ 46,969	$ 47,591

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