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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
U.S. statutory rate     35.00%  
Effective tax rate (37.80%) 6.90% (8.20%) 8.70%
Unrecognized tax benefits $ 2.6   $ 2.6  
Unrecognized tax benefits that would have a favorable impact on effective tax rate $ 2.3   $ 2.3