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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION
Deferred cost					$ 2,991	$ 3,668
Deferred costs incurred to fulfill contracts with customers	$ 3,157	$ 1,625	$ 3,157	$ 1,625
Total deferred costs amortized	14,757	12,485	29,004	35,773
Deferred revenue	2,779	4,587	2,779	4,587	$ 6,314	$ 5,385
Revenue recognized that was included in deferred revenue balances at beginning of period	$ 634	$ 96	$ 5,945	$ 4,806

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