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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |  |
Increase in valuation allowance |  | $ 249,200 | $ 317,400 |  |
Benefit of federal net operating loss deferred tax assets |  | 6,000 |  |  |
Benefit of state net operating loss deferred tax assets |  | 600 |  |  |
Total unrecognized tax benefit |  | $ 18,786 | 16,785 | $ 18,735 | $ 16,952
Period of increase or decrease in total amount of unrecognized income tax benefits |  | 12 months |  |  |
Accrued interest or penalties |  | $ 0 | $ 0 |  |
Statutory tax rate |  | 35.00% | 35.00% | 35.00% |
Pprovisional adjustments to tax provision |  | $ 113,000 |  |  |
Scenario, Plan [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Statutory tax rate | 21.00% |  |  |  |
Accumulated foreign subsidiary earnings tax rate | 15.50% |  |  |  |
Remaining earnings tax rate | 8.00% |  |  |  |
Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | $ 757,000 |  |  |
Net operating loss carryforward, expiration |  | 2024 |  |  |
Research and development credit carryforward |  | $ 30,800 |  |  |
Research and developmen tax credit carryforward, expiration |  | 2024 |  |  |
State [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | $ 532,200 |  |  |
Net operating loss carryforward, expiration |  | 2017 |  |  |
Research and development credit carryforward |  | $ 31,800 |  |  |

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