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Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Taxes [Abstract]          
Provision or benefit for income taxes  
Unrecognized tax benefits $ 0   $ 0    
Federal net operating loss carryforwards         $ 26,400,000