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Summary of Significant Accounting Policies (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Impairment     $ 0 $ 0  
Federal tax rate     21.00%    
Operating segments | segment     1    
Cumulative-effect         $ 1,400,000
Illinois [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk 22.30% 28.00% 25.80% 29.70%