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Summary of Significant Accounting Policies Income tax (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Deferred Tax Assets, Net $ 0   $ 0  
Income tax expense $ 1,284 $ 0 $ 1,584 $ 0