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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 |

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