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OTHER INCOME AND EXPENSES
 12 Months Ended
Dec. 31, 2019
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:
 
2019
 
2018
 
2017
 
Revenue
 
Expense
 
Revenue
 
Expense
 
Revenue
 
Expense
Operating and maintenance
$
12,655

 
$
13,791

 
$
10,392

 
$
11,895

 
$
8,621

 
$
8,847

Leases
2,279

 
35

 
2,467

 
135

 
2,015

 
182

Design and construction
1,745

 
1,612

 
1,273

 
1,202

 
1,918

 
1,635

Meter reading and billing
412

 
163

 
391

 
157

 
256

 
(6
)
Interest income
92

 
—

 
133

 
—

 
68

 
—

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

 
(5,104
)
 
—

 
2,340

 
—

 
(3,057
)
Other non-regulated income and expenses
2,022

 
3,372

 
3,616

 
7,058

 
3,020

 
1,789

Total
$
19,205

 
$
13,869

 
$
18,272

 
$
22,787

 
$
15,898

 
$
9,390


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 typically 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. The 2018 other non-regulated income and expenses included $5.4 million of business development expenses.