FINANCIAL INFORMATION Revenue, Initial Application Period Cumulative Effect Transition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accrued expenses and other current liabilities	$ 42,928	$ 31,549
Accounts receivable, net of allowances of $1,268 and $11,143 at March 31, 2018 and December 31, 2017, respectively	52,532	40,134
Contract with Customer, Asset, Gross	11,756	0
Inventory, Net	(32,887)	(38,421)
Other long-term assets	11,974	10,811
Assets	250,781	234,684
Deferred Revenue, Current	(89,420)	(121,184)
Deferred Revenue, Noncurrent	(16,953)	(73,429)
Liabilities	(422,411)	(503,254)
Accumulated deficit	(1,189,102)	(1,284,703)
Stockholders' Equity Attributable to Parent	(171,630)	(268,570)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accrued expenses and other current liabilities		11,139
Accounts receivable, net of allowances of $1,268 and $11,143 at March 31, 2018 and December 31, 2017, respectively		21,088
Contract with Customer, Asset, Gross		6,579
Inventory, Net		(5,716)
Other long-term assets		865
Assets		22,816
Deferred Revenue, Current		(37,794)
Deferred Revenue, Noncurrent		(55,079)
Liabilities		(81,734)
Accumulated deficit		104,550
Stockholders' Equity Attributable to Parent		104,550
Revenues	$ 3,000
Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accrued expenses and other current liabilities		42,688
Accounts receivable, net of allowances of $1,268 and $11,143 at March 31, 2018 and December 31, 2017, respectively		61,222
Contract with Customer, Asset, Gross		6,579
Inventory, Net		(32,705)
Other long-term assets		11,676
Assets		257,500
Deferred Revenue, Current		(83,390)
Deferred Revenue, Noncurrent		(18,350)
Liabilities		(421,520)
Accumulated deficit		(1,180,153)
Stockholders' Equity Attributable to Parent		$ (164,020)