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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, Aceland Investments Limited (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2010	Jun. 30, 2011	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Debt instrument, maturity date		Dec. 31, 2015
Equity pick up of gain (loss) of an associate			$ (400)	$ (613)	$ (687)	$ 984
ACELAND
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Cash paid to acquire investment	$ 2,100
Contribution of equity investment through a shareholder loan		$ 7,100
Equity method investment, ownership interest (as a percent)					35.00%
Investment impairment							$ 1,000
Proceeds from sale, maturity and collection of investments						6,700
Equity pick up of gain (loss) of an associate				300	$ (200)	$ 1,000
Carrying amount of the investment			$ 2,100	$ 2,100

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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