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INCOME TAXES - Unrecognized Tax Benefit Rollforward (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Gross unrecognized tax benefits, roll forward  
Balance at the beginning of the period $ 9
Additions for tax positions related to the prior year 6,540
Decreases related to settlement with taxing authority (9)
Balance at the end of the period 6,540
Accrued interest and penalties related to unrecognized tax benefits $ 1,200