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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2019
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)
 
2019
 
2018
GSWC
 
 

 
 

Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
 
$
22,535

 
$
17,763

Costs deferred for future recovery on Aerojet case
 
8,292

 
9,516

Pensions and other post-retirement obligations (Note 12)
 
40,693

 
33,124

Derivative unrealized loss (Note 5)
 
3,171

 
311

General rate case memorandum accounts
 
4,820

 
5,054

Other regulatory assets
 
18,842

 
18,440

Excess deferred income taxes (Note 11)
 
(79,886
)
 
(81,465
)
Flow-through taxes, net (Note 11)
 
(12,439
)
 
(15,273
)
Tax Cuts and Jobs Act ("Tax Act") memorandum accounts
 
—

 
(8,293
)
Various refunds to customers
 
(8,478
)
 
(7,517
)
Total
 
$
(2,450
)
 
$
(28,340
)