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OTHER INCOME AND EXPENSES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other income and expenses |  |  |
Revenue | $ 16,922 | $ 19,205 | $ 18,272
Expense | 14,300 | 13,869 | 22,787
New development expense |  |  | 5,400
Operating and maintenance revenue |  |  |
Other income and expenses |  |  |
Revenue | 11,481 | 12,655 | 10,392
Expense | 13,551 | 13,791 | 11,895
Leases |  |  |
Other income and expenses |  |  |
Revenue | 2,398 | 2,279 | 2,467
Expense | 48 | 35 | 135
Design and construction |  |  |
Other income and expenses |  |  |
Revenue | 802 | 1,745 | 1,273
Expense | 704 | 1,612 | 1,202
Meter reading and billing |  |  |
Other income and expenses |  |  |
Revenue | 458 | 412 | 391
Expense | 109 | 163 | 157
Interest income |  |  |
Other income and expenses |  |  |
Revenue | 52 | 92 | 133
Expense | 0 | 0 | 0
Change in value of life insurance contracts (gain) loss |  |  |
Other income and expenses |  |  |
Revenue | 0 | 0 | 0
Expense | (4,293) | (5,104) | 2,340
Other non-regulated income and expenses |  |  |
Other income and expenses |  |  |
Revenue | 1,731 | 2,022 | 3,616
Expense | $ 4,181 | $ 3,372 | $ 7,058

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