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Regulatory Matters: (Tables)
 3 Months Ended
Mar. 31, 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)
 
March 31,
2020
 
December 31,
2019
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
 
$
25,011

 
$
22,535

Costs deferred for future recovery on Aerojet case
 
8,097

 
8,292

Pensions and other post-retirement obligations (Note 8)
 
40,170

 
40,693

Derivative unrealized loss (Note 5)
 
4,280

 
3,171

General rate case memorandum accounts
 
3,551

 
4,820

Excess deferred income taxes
 
(79,522
)
 
(79,886
)
Flow-through taxes, net
 
(12,246
)
 
(12,439
)
Other regulatory assets
 
19,845

 
18,842

Various refunds to customers
 
(7,319
)
 
(8,478
)
Total
 
$
1,867

 
$
(2,450
)