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INCOME TAXES - Unrecognized Tax Benefit Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 5,421 $ 2,203 $ 0
(Decrease) increase related to prior year tax positions (5,421) 369 345
Increase in current year tax positions 0 2,849 1,858
Ending balance $ 0 $ 5,421 $ 2,203