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REVENUE RECOGNITION, Disaggregated Revenues (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
REVENUE RECOGNITION [Abstract] |  |  |  |
Refund to customers through reduced tariff rates | $ 3,800 |  |  |
Minimum number of days for accounts receivable from tariff contract customers |  | 25 days |  |
Increase in reserve for bad debt |  | $ 500 |  |
Minimum number of days due for accounts receivable from SLP Plan customer |  | 25 days |  |
Minimum number of days customers services invoiced in advance |  | 30 days |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Other Operating Revenue not in scope of ASC 606 |  | $ 1,516 | $ 1,413 | $ 1,271
Total Tariff Revenue |  | 88,141 | 83,595 | 80,411
Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 81,050 | 76,637 | 73,585
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 47,145 | 45,451 | 47,747
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 27,109 | 26,216 | 25,557
Tariff Revenue [Member] | Service Charges [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 351 | 617 | 718
Tariff Revenue [Member] | DSIC [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 4,997 | 4,331 | 2,797
Tariff Revenue [Member] | Industrial Wastewater Services [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 1,448 | 22 | 0
Tariff Revenue [Member] | Revenue Reserved for Refund - TCJA Impact [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 0 | 0 | (3,234)
Non-Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 5,575 | 5,545 | 5,555
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 4,381 | 4,177 | 3,992
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 840 | 1,122 | 1,352
Non-Tariff Revenue [Member] | Design and Installation [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | 88 | 0 | 0
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total Tariff Revenue |  | $ 266 | $ 246 | $ 211

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