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OTHER INCOME AND EXPENSES
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
OTHER INCOME AND EXPENSES
OTHER INCOME AND EXPENSES
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


Operating and maintenance services and meter reading and billing services are provided for water and wastewater systems owned by private companies and municipalities. The agreements call for a fee-per-service or a flat-rate amount per month. Leases have been entered into with telecommunications companies for cellular phone antennas placed on the Company's property. Design and construction services are for the design and installation of water mains and other water infrastructure for others outside the Company's regulated service areas. Third-party insurance program gains and losses are included in other non-regulated income and expenses. Also, the 2016 other non-regulated income and expenses included a litigation gain of $1.5 million.