Business Segments: (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of reporting segments information

The tables below set forth information relating to GSWC’s operating segments, ASUS and its subsidiaries and other matters. Total assets by segment are not presented below, as certain of Registrant’s assets are not tracked by segment.  The utility plant amounts are net of respective accumulated provisions for depreciation. Capital additions reflect capital expenditures paid in cash, and exclude U.S. government- and third-party contractor-funded capital expenditures for ASUS and property installed by developers and conveyed to GSWC.

	As Of And For The Three Months Ended June 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	76,733	$	7,841	$	22,327		$	—		$	106,901
Operating income (loss)	21,244		1,401		2,925			(2		)	25,568
Interest expense, net	5,047		353		(71		)	83			5,412
Utility plant	1,166,867		60,504		11,418			—			1,238,789
Depreciation and amortization expense (1)	8,866		564		580			—			10,010
Income tax expense (benefit)	3,909		305		705			(532		)	4,387
Capital additions	24,768		1,150		2,500			—			28,418

	As Of And For The Three Months Ended June 30, 2017
	GSWC						AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS		Parent			AWR
Operating revenues	$	80,734	$	7,612	$	24,849	$	—		$	113,195
Operating income (loss) (2)	33,695		1,534		6,800		(3		)	42,026
Interest expense, net	4,805		350		82		69			5,306
Utility plant	1,093,104		56,371		5,728		—			1,155,203
Depreciation and amortization expense (1)	8,858		536		253		—			9,647
Income tax expense (benefit)	11,710		439		2,347		(189		)	14,307
Capital additions	20,593		978		331		—			21,902

	As Of And For The Six Months Ended June 30, 2018
	GSWC							AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS			Parent			AWR
Operating revenues	$	141,145	$	17,673	$	42,811		$	—		$	201,629
Operating income (loss)	35,302		3,640		5,322			(5		)	44,259
Interest expense, net	10,056		723		(137		)	157			10,799
Utility plant	1,166,867		60,504		11,418			—			1,238,789
Depreciation and amortization expense (1)	17,635		1,129		912			—			19,676
Income tax expense (benefit)	5,558		771		1,259			(637		)	6,951
Capital additions	51,386		2,124		5,272			—			58,782

	As Of And For The Six Months Ended June 30, 2017
	GSWC						AWR			Consolidated
(dollars in thousands)	Water		Electric		ASUS		Parent			AWR
Operating revenues	$	147,138	$	18,114	$	46,753	$	—		$	212,005
Operating income (loss) (2)	52,792		4,313		9,504		(7		)	66,602
Interest expense, net	9,950		725		156		121			10,952
Utility plant	1,093,104		56,371		5,728		—			1,155,203
Depreciation and amortization expense (1)	17,759		1,073		498		—			19,330
Income tax expense (benefit)	17,195		1,227		3,208		(468		)	21,162
Capital additions	43,577		1,701		618		—			45,896

(1)     Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $61,000 and $59,000 for the three months ended June 30, 2018 and 2017, respectively, and $121,000 and $120,000 for the six months ended June 30, 2018 and 2017, respectively.

(2) Adjusted to conform to current-year presentation pursuant to the adoption of ASU 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.

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 ratemaking) to total consolidated assets (in thousands):

	June 30,
	2018		2017
Total utility plant	$	1,238,789	$	1,155,203
Other assets	202,333		307,450
Total consolidated assets	$	1,441,122	$	1,462,653