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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2018
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)
 
2018
 
2017
GSWC
 
 

 
 

Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
 
$
17,763

 
$
29,556

Costs deferred for future recovery on Aerojet case
 
9,516

 
10,656

Pensions and other post-retirement obligations (Note 12)
 
33,124

 
33,019

Derivative unrealized loss (Note 5)
 
311

 
2,941

Low income rate assistance balancing accounts
 
2,784

 
5,972

General rate case memorandum accounts
 
5,054

 
10,522

Other regulatory assets
 
15,656

 
16,393

Excess deferred income taxes (Note 11)
 
(81,465
)
 
(83,231
)
Flow-through taxes, net (Note 11)
 
(15,273
)
 
(17,716
)
Tax Cuts and Jobs Act ("Tax Act") memorandum accounts
 
(8,293
)
 
—

Various refunds to customers
 
(7,517
)
 
(6,070
)
Total
 
$
(28,340
)
 
$
2,042