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Income Taxes (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Subsidiary | Jun. 30, 2014 USD ($)
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating losses or credits utilization period |  |  | 1 year |
Period with in which cumulative ownership change |  |  | 3 years |
Gross unrecognized tax benefits | $ 16,400,000 |  | $ 16,400,000 |
Unrecognized tax benefits interest and penalties | 0 |  |  |
Unrecognized tax benefits accrued interest and penalties | 0 |  | $ 0 |
Number of partially owned subsidiaries | Subsidiary |  |  | 3 |
Federal income tax benefit or expense | $ 0 | $ 0 | $ 0 | $ 0
Minimum [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Change in cumulative ownership percentage (in hundredths) |  |  | 50.00% |

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Paragraph Question 1-7 + Details
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