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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |  |
Increase in valuation allowance | $ 317,400 | $ 285,600 |  |
Benefit of federal net operating loss deferred tax assets | 6,000 |  |  |
Benefit of state net operating loss deferred tax assets | 400 |  |  |
Total unrecognized tax benefit | $ 16,785 | 18,735 | $ 16,952 | $ 11,634
Period of increase or decrease in total amount of unrecognized income tax benefits | 12 months |  |  |
Accrued interest or penalties | $ 0 | $ 0 |  |
Domestic Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 684,000 |  |  |
Net operating loss carryforward, expiration | 2024 |  |  |
Research and development credit carryforward | $ 26,900 |  |  |
Research and developmen tax credit carryforward, expiration | 2024 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 574,100 |  |  |
Net operating loss carryforward, expiration | 2016 |  |  |
Research and development credit carryforward | $ 29,000 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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