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INCOME TAXES (Summary of Components of Net Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Assets    
Allowances and reserves $ (8,254) $ 4,920
Net operating loss carryforward 214,664 230,597
Tax credit carryforwards 60,385 87,703
Capital loss carryforwards 3,742 3,997
Writedown/amortization of intangible assets and goodwill 8,051 12,997
Fixed assets 4,428 6,008
Demo equipment income 7,071 7,070
Other 38,878 22,683
Total Deferred Tax Assets 328,965 375,975
Deferred Tax Liabilities    
Prepaid expense 126 (576)
Accrued warranties 1,230 (2,494)
Other (278) (281)
Total Deferred Tax Liabilities 1,078 (3,351)
Total Deferred Tax Assets (Liabilities) 330,043 372,624
Less: Valuation Allowance (327,324) (368,672)
Total Deferred Tax Assets (Liabilities) $ 2,719 $ 3,952