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BUSINESS COMBINATIONS - Accrued Restructuring (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Restructuring Reserve [Abstract]    
Restructuring charges, beginning balance $ 650 $ 1,686
IncreaseDecreaseInRestructuringReserve 15,005 0
PaymentsForRestructuring (664) (1,036)
Restructuring charges, ending balance 16,086 650
RestructuringReserveNoncurrent (4,413) (576)
Restructuring Reserve Current $ 11,673 $ 74