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Income Taxes - Net Operating Loss Carry Forward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]    
Market capitalization used in net operating loss analysis   $ 124.5
Annual limitation on usage of net operating losses $ 3.0  
Federal [Member]    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards   $ 210.3