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Income Taxes - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Effective tax rate 28.30% (30.40%) 26.00% 5.70%
U.S. statutory rate 35.00% 35.00% 35.00% 35.00%