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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Inventory valuation $ 8,943 $ 8,007
Net operating losses 67,787 73,458
Credit carry forwards 52,592 34,966
Warranty and installation accruals 1,695 1,690
Share-based compensation 6,981 7,385
Other 2,182 1,832
Total deferred tax assets 140,180 127,338
Valuation allowance (114,955) (100,456)
Net deferred tax assets 25,225 26,882
Deferred tax liabilities:    
Purchased intangible assets 15,401 45,807
Convertible Senior Notes 11,265 13,534
Depreciation 2,380 1,339
Total deferred tax liabilities 29,046 60,680
Net deferred taxes (3,821) $ (33,798)
Undistributed earnings of foreign subsidiaries    
Undistributed earnings of foreign subsidiaries $ 600