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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Inventory valuation $ 6,681 $ 6,334
Net operating losses and credit carry forwards 54,527 33,181
Credit carry forwards 24,598 20,738
Warranty and installation accruals 1,757 3,022
Share-based compensation 12,624 12,461
Other 6,778 5,787
Total deferred tax assets 106,965 81,523
Valuation allowance (106,793) (56,273)
Net deferred tax assets 172 25,250
Deferred tax liabilities:    
Purchased intangible assets 11,071 32,550
Undistributed earnings 186 618
Depreciation 69 1,908
Total deferred tax liabilities 11,326 35,076
Net deferred taxes (11,154) $ (9,826)
Undistributed earnings of foreign subsidiaries    
Undistributed earnings of foreign subsidiaries $ 48,200