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Income Taxes Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ (6,821) | $ (6,814) | $ (11,899)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 11 | 20 | 17
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | (7,815) | (8,849) | (8,153)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | (4,489) | 8,640 | 23,666
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount | (2,750) | 74 | (5,713)
Income Tax Reconciliation Foreign Dividends | 3,936 | 1,103 | 0
Income tax impact to provision due to transaction costs | 0 | 0 | 553
Tax Adjustments, Settlements, and Unusual Provisions | 1,887 | (27) | (917)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | 1,244 | 1,463 | 1,993
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount | 0 | 0 | (5)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | 716 | 1,319 | 1,730
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | (103) | 1,960 | (1,368)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 0 | 185 | 25,205
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount | 0 | 0 | 1,257
Attribute expirations | (2,837) | 0 | 0
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | (1,239) | (5,727) | (51,177)
Provision (benefit) for income taxes | $ (12,586) | $ (6,653) | $ (24,811)

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