OTHER SUPPLEMENTAL INFORMATION - Total Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Trade receivables	$ 93,370	$ 82,115
Other receivables	4,042	2,104
Total accounts receivable	97,412	84,219
Less: allowance for doubtful accounts	(19,130)	(12)
Total accounts receivable, net	78,282	84,207
Current accounts receivable, net	19,165	6,105
Long-term accounts receivable, net	$ 59,117	$ 78,102

Trade receivable.

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amount due from parties in nontrade transactions, classified as other.

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