Business Segments (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of reporting segments information

Capital additions reflect capital expenditures paid in cash and exclude U.S. government-funded and third-party prime funded capital expenditures for ASUS and property installed by developers and conveyed to GSWC.

	As Of And For The Year Ended December 31, 2019
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	319,830	$	39,548	$	114,491		$	—		$	473,869
Operating income (loss)	93,895		11,197		21,990			(9		)	127,073
Interest expense, net	20,304		1,228		(734		)	539			21,337
Utility Plant	1,322,062		72,680		20,963			—			1,415,705
Depreciation and amortization expense (1)	29,956		2,485		2,956			—			35,397
Income tax expense/(benefit)	17,295		2,882		5,202			(709		)	24,670
Capital additions	131,353		11,499		9,088			—			151,940

	As Of And For The Year Ended December 31, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	295,258	$	34,350	$	107,208		$	—		$	436,816
Operating income	74,342		6,220		20,414			7			100,983
Interest expense, net	18,403		1,328		(327		)	451			19,855
Utility Plant	1,218,468		62,624		15,218			—			1,296,310
Depreciation and amortization expense (1)	36,137		2,258		2,030			—			40,425
Income tax expense/(benefit)	12,391		1,212		4,939			(525		)	18,017
Capital additions	110,934		5,420		10,207			—			126,561

	As Of And For The Year Ended December 31, 2017
	GSWC						AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS		Parent			AWR
Operating revenues	$	306,332	$	33,969	$	100,302	$	—		$	440,603
Operating income (loss)	98,678		7,193		21,320		(96		)	127,095
Interest expense, net	18,909		1,380		255		248			20,792
Utility Plant	1,137,995		59,945		7,052		—			1,204,992
Depreciation and amortization expense (1)	35,706		2,146		1,179		—			39,031
Income tax expense/(benefit)	32,212		1,847		7,136		(2,221		)	38,974
Capital additions	104,546		5,941		2,639		—			113,126

Schedule of reconciliation of total utility plant (a key figure for rate-making) to total consolidated assets

The following table reconciles total utility plant (a key figure for rate-making) to total consolidated assets (in thousands):

	December 31,
	2019		2018
Total utility plant	$	1,415,705	$	1,296,310
Other assets	225,626		205,123
Total consolidated assets	$	1,641,331	$	1,501,433