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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Examination [Line Items] |  |  |
Tax benefit from adjustment | $ 1,524 |  |
Tax expense from revalue of deferred tax liabilities | 1,524 |  |
Difference between effective tax rate and federal statutory rate |  |  | 33.60%
Deferred income tax assets | 41,356 | $ 35,004 |
Net operating loss carryforwards | 288,959 | 237,186 |
Loss carryforwards for U.S. federal income tax purposes | 156,685 | 115,846 |
Loss carryforwards for U.S. state income tax purposes | 122,497 | 101,563 |
Loss carryforwards for foreign income tax purposes | 9,777 | 19,777 |
Unremitted earnings | 92,876 |  |
Unrecognized deferred tax liabilities | 14,000 |  |
Unrecognized benefits | $ 8,272 | $ 2,993 |
U.S Federal Income Tax |  |  |
Income Tax Examination [Line Items] |  |  |
Difference in effective rate due to Tax Act | 25.60% | 48.60% |
Research and experimentation tax credit carryforwards | $ 2,934 | $ 2,845 |
Foreign tax credits | 4,026 | 3,549 |
Other tax credits | 474 | 474 |
U.S. State Income Tax |  |  |
Income Tax Examination [Line Items] |  |  |
Research and experimentation tax credit carryforwards | 4,049 | 3,745 |
Foreign Income Tax |  |  |
Income Tax Examination [Line Items] |  |  |
Research and experimentation tax credit carryforwards | 915 | 170 |
Other State Income Tax |  |  |
Income Tax Examination [Line Items] |  |  |
Other tax credits | $ 729 | $ 600 |

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