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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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	$ 7,367	$ 1,952	$ 7,367	$ 1,952
Total deferred costs amortized	7,248	10,273	14,247	23,288
Deferred revenue	7,103	8,995	7,103	8,995	$ 6,314	$ 5,385
Revenue recognized that was included in deferred revenue balances at beginning of period	$ 1,628	$ 55	$ 5,311	$ 4,710

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