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RESTRUCTURING - Restructuring Reserve (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Reserve [Roll Forward]      
Balance at beginning of period $ 202 $ 0  
Accrual:      
Continuing Operations 4,431 5,326 $ 0
Discontinued Operations 0 3,794  
Total 4,431 9,120  
Payments (4,516) (8,918)  
Balance at end of period 117 202 $ 0
Severance and other employee related costs      
Accrual:      
Continuing Operations 4,431 5,326  
Discontinued Operations 0 2,899  
Total 4,431 8,225  
Payments (4,516) (8,023)  
Other restructuring expense      
Accrual:      
Continuing Operations   0  
Discontinued Operations   895  
Total   895  
Payments $ 0 $ (895)