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INCOME TAXES (Summary of Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Assets |  |
Net operating loss carryforward | $ 237,393 | $ 215,737
Tax credit carryforwards | 67,579 | 60,385
Capital loss carryforwards |  | 3,742
Written-down/amortization of intangible assets and goodwill | 5,554 | 8,051
Fixed assets | 5,997 | 4,428
Demo equipment income | 7,357 | 7,071
Prepaid expense | 736 | 126
Accrued warranties | (92) | 1,230
Other | 16,352 | 38,878
Total Deferred Tax Assets | 340,876 | 339,648
Deferred Tax Liabilities |  |
Allowances and reserves | (8,969) | (8,254)
Other | (335) | (278)
Total Deferred Tax Liabilities | (9,304) | (8,532)
Total Deferred Tax Assets | 331,572 | 331,116
Less: Valuation Allowance | (329,523) | (328,397)
Net Deferred Tax Assets | $ 2,049 | $ 2,719

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