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Organization and Significant Accounting Policies, Income Taxes (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]        
U.S. federal corporate tax rate   35.00% 35.00% 35.00%
Plan [Member]        
Income Taxes [Abstract]        
U.S. federal corporate tax rate 21.00%