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REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Contract with Customer, Asset and Liability [Abstract]
Total Deferred Revenue	$ 1,200	$ 1,301
Tariff Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Contract Assets	2,146	2,146
Total Deferred Revenue	979	1,050
Tariff Deferred Revenue	1,000
Non-Tariff Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Total Deferred Revenue	221	$ 251
Tariff Deferred Revenue	$ 200

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- References

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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-Publisher FASB
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-Topic 606
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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+ References

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