RESTRUCTURING ACTIVITIES - Liabilities Recorded For The Restructuring Plan (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Roll Forward]
Beginning balance	$ 1,216
Recognized Restructuring Expense	3,173
Costs Paid or Otherwise Settled	(4,239)
Ending balance	150
Severance
Restructuring Cost and Reserve [Roll Forward]
Beginning balance	0
Recognized Restructuring Expense	2,401
Costs Paid or Otherwise Settled	(2,251)
Ending balance	150
Other cash restructuring expenses
Restructuring Cost and Reserve [Roll Forward]
Beginning balance	1,216
Recognized Restructuring Expense	772
Costs Paid or Otherwise Settled	(1,988)
Ending balance	$ 0