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OTHER INCOME AND EXPENSES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other income and expenses |  |  |
Revenue from contracts with customers | $ 765,704 | $ 697,577 | $ 664,358
Change in value of life insurance contracts gain | (3,800) | (4,293) | (5,104)
Nonoperating expense | 17,234 | 14,300 | 13,869
Revenue | 22,761 | 16,922 | 19,205
Expense | 17,234 | 14,300 | 13,869
Operating and maintenance revenue |  |  |
Other income and expenses |  |  |
Revenue from contracts with customers | 16,276 | 11,481 | 12,655
Expense from contract with customer | 16,344 | 13,551 | 13,791
Leases |  |  |
Other income and expenses |  |  |
Lease revenue | 2,744 | 2,398 | 2,279
Lease expense | 230 | 48 | 35
Design and construction |  |  |
Other income and expenses |  |  |
Revenue from contracts with customers | 619 | 802 | 1,745
Expense from contract with customer | 611 | 704 | 1,612
Meter reading and billing |  |  |
Other income and expenses |  |  |
Revenue from contracts with customers | 495 | 458 | 412
Expense from contract with customer | 79 | 109 | 163
Interest income |  |  |
Other income and expenses |  |  |
Interest income | 171 | 52 | 92
Other non-regulated income and expenses |  |  |
Other income and expenses |  |  |
Nonoperating income | 2,456 | 1,731 | 2,022
Nonoperating expense | $ 3,770 | $ 4,181 | $ 3,372

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