RESTRUCTURING - ROLLFORWARD (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Accrued restructuring and severance costs rollforward
Net accruals	$ 13,247
Cash paid	(3,764)
Balance at end of period	9,483
Restructuring and related liabilities payables	9,500
Minimum
Accrued restructuring and severance costs rollforward
Expected total costs incurred	27,000
Maximum
Accrued restructuring and severance costs rollforward
Expected total costs incurred	33,000
Employee seperation costs
Accrued restructuring and severance costs rollforward
Net accruals	13,247
Cash paid	(3,764)
Balance at end of period	$ 9,483