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RESTRUCTURING - Restructuring Reserve (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Restructuring Reserve [Roll Forward]      
Balance at beginning of period $ 202 $ 0 $ 0
Accrual:      
Continuing Operations 0 5,287  
Discontinued Operations   3,218  
Total   8,505 9,100
Payments (41) (1,503)  
Balance at end of period 161 7,002 $ 202
Severance and other employee related costs      
Accrual:      
Continuing Operations   5,287  
Discontinued Operations   2,323  
Total   7,610  
Payments (41) (1,503)  
Other restructuring expense      
Accrual:      
Continuing Operations   0  
Discontinued Operations   895  
Total   895  
Payments $ 0 $ 0