INCOME TAXES - Operating Loss Carryforwards Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 160,300
Increase (decrease) in valuation allowance	0	$ (200)
Valuation allowance attributable to tax benefits of share based compensation	24,700
Valuation allowance	126,252	137,957
Tax benefits related to share based compensation not included in the deferred tax assets	10,100
Undistributed earnings of foreign subsidiaries	$ 2,000
Tax holidays and tax incentive programs expiration	12/31/2016
United States and Certain Foreign [Member]
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance	$ 11,700	$ 2,300
Federal [Member]
Operating Loss Carryforwards [Line Items]
Research and development tax credit carryforwards	26,700
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	77,000
Research and development tax credit carryforwards	$ 45,600