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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION
Deferred costs incurred to fulfill contracts with customers	$ 4,688	$ 3,180	$ 2,991	$ 3,668
Total deferred costs amortized	6,999	13,015
Revenue recognized that was included in deferred revenue balances at beginning of period	3,683	$ 4,655
Deferred revenue	$ 5,833		$ 6,314	$ 5,385

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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