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Accounts Receivable:
6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Accounts Receivable ACCOUNTS RECEIVABLE

Following is a summary of Accounts receivable, net included in the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:
 
Accounts
Unbilled
Less Allowance for
Accounts
June 30, 2019
Receivable, Trade
Revenue
 Doubtful Accounts
Receivable, net
Electric Utilities
$
39,982

$
31,573

$
(526
)
$
71,029

Gas Utilities
67,686

23,753

(4,391
)
87,048

Power Generation
2,867



2,867

Mining
2,505



2,505

Corporate
3,233


(169
)
3,064

Total
$
116,273

$
55,326

$
(5,086
)
$
166,513


 
Accounts
Unbilled
Less Allowance for
Accounts
December 31, 2018
Receivable, Trade
Revenue
 Doubtful Accounts
Receivable, net
Electric Utilities
$
39,721

$
35,125

$
(448
)
$
74,398

Gas Utilities
96,123

90,521

(2,592
)
184,052

Power Generation
1,876



1,876

Mining
3,988



3,988

Corporate
5,008


(169
)
4,839

Total
$
146,716

$
125,646

$
(3,209
)
$
269,153