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Regulatory Matters: (Tables)
 6 Months Ended
Jun. 30, 2020
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:
(dollars in thousands)
 
June 30,
2020
 
December 31,
2019
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
 
$
29,495

 
$
22,535

Costs deferred for future recovery on Aerojet case
 
7,745

 
8,292

Pensions and other post-retirement obligations (Note 8)
 
40,850

 
40,693

Derivative unrealized loss (Note 5)
 
3,827

 
3,171

General rate case memorandum accounts
 
2,035

 
4,820

Excess deferred income taxes
 
(79,158
)
 
(79,886
)
Flow-through taxes, net
 
(11,788
)
 
(12,439
)
Other regulatory assets
 
19,752

 
18,842

Various refunds to customers
 
(6,722
)
 
(8,478
)
Total
 
$
6,036

 
$
(2,450
)