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OTHER INCOME AND EXPENSES (Tables)
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Schedule of various non-regulated activities
The Company conducts various non-regulated activities as reflected in the table below:
 
2018
 
2017
 
2016
 
Revenue
 
Expense
 
Revenue
 
Expense
 
Revenue
 
Expense
Operating and maintenance
$
10,392

 
$
11,895

 
$
8,621

 
$
8,847

 
$
8,430

 
$
9,061

Leases
2,467

 
135

 
2,015

 
182

 
1,923

 
204

Design and construction
1,273

 
1,202

 
1,918

 
1,635

 
1,792

 
1,473

Meter reading and billing
391

 
157

 
256

 
(6
)
 
242

 
62

Interest income
133

 
—

 
68

 
—

 
18

 
—

Change in value of life insurance contracts loss (gain)
—

 
2,340

 
—

 
(3,057
)
 
—

 
(1,026
)
Other non-regulated income and expenses
3,616

 
7,058

 
3,020

 
1,789

 
4,180

 
1,671

Total
$
18,272

 
$
22,787

 
$
15,898

 
$
9,390

 
$
16,585

 
$
11,445