CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Revenues
Water		$ 302,931	$ 328,511	$ 326,672
Electric		35,771	36,039	34,387
Contracted services		97,385	94,091	104,732
Total operating revenues		436,087	458,641	465,791
Operating Expenses
Water purchased		64,442	62,726	57,790
Power purchased for pumping		8,663	8,988	10,700
Groundwater production assessment		14,993	13,648	16,450
Power purchased for resale		10,387	10,395	9,649
Supply cost balancing accounts		(12,206)	7,785	6,346
Other operation		28,257	28,429	28,288
Administrative and general		80,994	79,817	78,268
Depreciation and amortization	[1]	38,850	42,033	41,073
Maintenance		16,470	16,885	16,092
Property and other taxes		16,801	16,636	16,722
Construction and Development Costs		53,720	52,810	65,368
Total operating expenses		321,371	340,152	346,746
Operating Income		114,716	118,489	119,045
Other Income and Expenses
Interest expense		(21,992)	(21,088)	(21,617)
Interest income		757	458	927
Other, net		997	356	751
Total other income and expenses		(20,238)	(20,274)	(19,939)
Income from operations before income tax expense		94,478	98,215	99,106
Income tax expense		34,735	37,731	38,048
Net Income		$ 59,743	$ 60,484	$ 61,058
Basic Earnings Per Common Share
Income from continuing operations (in dollars per share)		$ 1.63	$ 1.61	$ 1.57
Net Income (in dollars per share)		1.63	1.61	1.57
Fully Diluted Earnings Per Share
Income from continuing operations (in dollars per share)		1.62	1.60	1.57
Net Income (in dollars per share)		$ 1.62	$ 1.60	$ 1.57
Weighted Average Number of Shares Outstanding (in shares)		36,552	37,389	38,658
Weighted Average Number of Diluted Shares (in shares)		36,750	37,614	38,880
Dividends Declared Per Common Share (in dollars per share)		$ 0.914	$ 0.874	$ 0.831
GSWC
Operating Revenues
Water		$ 302,931	$ 328,511	$ 326,672
Electric		35,771	36,039	34,387
Total operating revenues		338,702	364,550	361,059
Operating Expenses
Water purchased		64,442	62,726	57,790
Power purchased for pumping		8,663	8,988	10,700
Groundwater production assessment		14,993	13,648	16,450
Power purchased for resale		10,387	10,395	9,649
Supply cost balancing accounts		(12,206)	7,785	6,346
Other operation		24,771	24,892	25,548
Administrative and general		64,066	64,877	65,814
Depreciation and amortization		37,804	40,893	39,854
Maintenance		14,519	14,693	13,945
Property and other taxes		15,444	15,244	15,221
Total operating expenses		242,883	264,141	261,317
Operating Income		95,819	100,409	99,742
Other Income and Expenses
Interest expense		(21,782)	(20,998)	(21,524)
Interest income		749	440	894
Other, net		792	212	751
Total other income and expenses		(20,241)	(20,346)	(19,879)
Income from operations before income tax expense		75,578	80,063	79,863
Income tax expense		28,609	32,472	32,006
Net Income		$ 46,969	$ 47,591	$ 47,857

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