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Income Taxes Components of Deferred Income Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Valuation Allowance [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 65,477 | $ 64,887
Deferred Tax Assets, Tax Credit Carryforwards, Research | 80,404 | 75,032
Deferred Tax Assets, Other | 7,768 | 7,965
Deferred Tax Asset, Lease obligation | 2,047 | 0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 1,441 | 2,504
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 3,460 | 2,550
Deferred Tax Assets, Gross | 160,597 | 152,938
Deferred Tax Assets, Valuation Allowance | (77,957) | (79,196)
Deferred Tax Assets, Net of Valuation Allowance | 82,640 | 73,742
Deferred Tax Liabilities, Other Finite-Lived Assets | (246) | (1,391)
Deferred Tax Liability, Leased right-of-use asset | (1,483) | 0
Deferred Tax Liabilities, Intangible Assets | (13,627) | (20,833)
Deferred Tax Assets, Net | 67,284 | $ 51,518
Foreign Tax Authority [Member] |  |
Valuation Allowance [Line Items] |  |
Deferred Tax Assets, Other Tax Carryforwards | $ 24,500 |

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