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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Inventory valuation $ 8,007 $ 6,681
Net operating losses 73,458 54,527
Credit carry forwards 34,966 24,598
Warranty and installation accruals 1,690 1,757
Share-based compensation 7,385 12,624
Other 1,966 6,778
Total deferred tax assets 127,472 106,965
Valuation allowance (100,684) (106,793)
Net deferred tax assets 26,788 172
Deferred tax liabilities:    
Purchased intangible assets 45,807 11,071
Undistributed earnings   186
Convertible Senior Notes 13,534  
Depreciation 1,339 69
Total deferred tax liabilities 60,680 11,326
Net deferred taxes (33,892) $ (11,154)
Undistributed earnings of foreign subsidiaries    
Foreign tax withholdings on unremitted earnings $ 6,200