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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits at January 1 $ 307 $ 553 $ 477
Increase in gross amounts of tax positions related to prior years 270 0 55
Increase in gross amounts of tax positions related to current year 0 0 93
Decrease due to lapse in statute of limitations (117) (246) (72)
Unrecognized tax benefits at December 31 $ 460 $ 307 $ 553