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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other than Temporary Impairment on Investment and Advertising Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment impairment $ 5,336 $ 16,347 $ 3,947
Advertising costs $ 100 $ 100 $ 100
Maximum      
Initial operating lease terms 5 years