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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 0.00%  
U.S. federal statutory rate 21.00% 35.00%
Effective Income Tax Rate Reconciliation, Percent 24.70% 33.90%