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RESTRUCTURING - Restructuring Reserve (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Restructuring Reserve [Roll Forward]          
Balance at beginning of period $ 161 $ 7,002 $ 202 $ 0 $ 0
Accrual:          
Continuing Operations 3,983 82 3,983 5,369  
Discontinued Operations 0 297 0 3,515  
Total 3,983 379 3,983 8,884 9,100
Payments (1,463) (6,694) (1,504) (8,197)  
Balance at end of period 2,681 687 2,681 687 $ 202
Severance and other employee related costs          
Accrual:          
Continuing Operations 3,983 82 3,983 5,369  
Discontinued Operations 0 297 0 2,620  
Total 3,983 379 3,983 7,989  
Payments $ (1,463) (5,799) $ (1,504) (7,302)  
Other restructuring expense          
Accrual:          
Continuing Operations       0  
Discontinued Operations       895  
Total       895  
Payments   $ (895)   $ (895)