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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
U.S. statutory rate 35.00%  
Effective tax rate (1.60%) 0.90%
Unrecognized tax benefits $ 3.3  
Unrecognized tax benefits that would have a favorable impact on effective tax rate $ 3.0