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REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract] |  |
Total Accounts Receivable | $ 6,060 | $ 6,034
Total Deferred Revenue | 1,224 | 1,256
Regulated Revenue [Member] |  |
Contract with Customer, Asset and Liability [Abstract] |  |
Total Accounts Receivable | 5,756 | 5,631
Contract Assets | 2,771 | 2,397
Total Deferred Revenue | 1,003 | 1,053
Refund Liability | 1,548 | 0
Deferred Revenue | 1,100 |
Non-Regulated Revenue [Member] |  |
Contract with Customer, Asset and Liability [Abstract] |  |
Total Accounts Receivable | 304 | 403
Total Deferred Revenue | 221 | $ 203
Deferred Revenue | $ 180 |

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