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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, ACELAND Investment Limited (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 24, 2016 | Dec. 31, 2010 | Dec. 31, 2016 | Jun. 30, 2011 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |
Equity pick up of gain (loss) of an associate |  |  |  |  | $ 984 | $ (13,954) | $ (8,878)
ACELAND |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |
Payments to acquire equity method investments |  | $ 2,100 |  |  |  |  |
Contribution of equity investment through a shareholder loan |  |  |  | $ 7,100 |  |  |
Equity method investment, ownership interest (as a percent) |  |  | 35.00% |  | 35.00% |  |
Proceeds from sale, maturity and collection of investments | $ 8,200 |  | $ 6,700 |  |  |  |
Equity pick up of gain (loss) of an associate |  |  |  |  | $ 1,000 |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  | $ 1,000 |
Carrying amount of the investment |  |  | $ 2,600 |  | $ 2,600 |  |
Wireless City | ACELAND |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |
Equity method investment, ownership interest (as a percent) |  |  |  |  |  | 5.82% |
Proceeds from sale, maturity and collection of investments | $ 23,500 |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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