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Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax [Line Items]        
Effective Income Tax Rate Reconciliation, Percent, Total (47.10%) 84.70% 121.00% 545.00%
Non Deductible Income Loss, Fair Value Adjustment Warrant Liability     $ 16,391 $ 4,645
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount     $ 11,313 $ 13,525
CREE Tax [Member]        
Income Tax [Line Items]        
Effective Income Tax Rate Reconciliation, Percent, Total     9.00%  
Income Tax [Member]        
Income Tax [Line Items]        
Effective Income Tax Rate Reconciliation, Percent, Total     25.00%