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BUSINESS COMBINATIONS - Accrued Restructuring (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Restructuring Reserve [Abstract]    
Restructuring charges, beginning balance $ 650 $ 1,686
IncreaseDecreaseInRestructuringReserve 0 0
PaymentsForRestructuring (56) (1,036)
Restructuring charges, ending balance 594 650
RestructuringReserveNoncurrent (521) (576)
Restructuring Reserve Current $ 73 $ 74