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OTHER INCOME AND EXPENSES (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Schedule of various non-regulated activities
The Company conducts various non-regulated activities as reflected in the table below:
 
2017
 
2016
 
2015
 
Revenue
 
Expense
 
Revenue
 
Expense
 
Revenue
 
Expense
Operating and maintenance
$
8,621

 
$
8,847

 
$
8,430

 
$
9,061

 
$
9,385

 
$
10,438

Leases
2,015

 
182

 
1,923

 
204

 
1,929

 
208

Design and construction
1,918

 
1,635

 
1,792

 
1,473

 
1,399

 
1,292

Meter reading and billing
256

 
(6
)
 
242

 
62

 
597

 
434

Interest income
68

 
—

 
18

 
—

 
39

 
—

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

 
(3,057
)
 
—

 
(1,026
)
 
—

 
218

Other non-regulated income and expenses
3,020

 
1,789

 
4,180

 
1,671

 
2,275

 
1,454

Total
$
15,898

 
$
9,390

 
$
16,585

 
$
11,445

 
$
15,624

 
$
14,044