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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2016
Income Tax Disclosure [Abstract]      
excess tax benefit related to stock based compensation $ 6.7    
Statutory federal rate 35.00% 35.00% 35.00%