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Regulatory Matters: (Tables)
 9 Months Ended
Sep. 30, 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:
(dollars in thousands)
 
September 30,
2019
 
December 31,
2018
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
 
$
29,228

 
$
17,763

Costs deferred for future recovery on Aerojet case
 
8,663

 
9,516

Pensions and other post-retirement obligations (Note 8)
 
32,222

 
33,124

Derivative unrealized loss (Note 5)
 
3,022

 
311

Low income rate assistance balancing accounts
 
538

 
2,784

General rate case memorandum accounts
 
6,014

 
5,054

Excess deferred income taxes
 
(80,303
)
 
(81,465
)
Flow-through taxes, net
 
(14,037
)
 
(15,273
)
Other regulatory assets
 
17,310

 
15,656

Tax Cuts and Jobs Act memorandum accounts
 
—

 
(8,293
)
Various refunds to customers
 
(7,921
)
 
(7,517
)
Total
 
$
(5,264
)
 
$
(28,340
)