Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2017

Regulated Operations [Abstract]

Schedule of regulatory assets, less regulatory liabilities in the consolidated balance sheets for continuing operations

Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:

	December 31,
(dollars in thousands)	2017			2016
GSWC
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account	$	29,556		$	47,340
Costs deferred for future recovery on Aerojet case	10,656			11,820
Pensions and other post-retirement obligations (Note 11)	33,019			28,118
Derivative unrealized loss (Note 4)	2,941			4,901
Low income rate assistance balancing accounts	5,972			8,272
General rate case memorandum accounts	10,522			13,929
Other regulatory assets	14,875			17,633
Excess deferred income taxes (Note 10)	(83,231		)	—
Flow-through taxes, net (Note 10)	(17,716		)	20,134
Various refunds to customers	(4,552		)	(5,866		)
Total	$	2,042		$	146,281