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Income Taxes Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Effective income tax rate 31.60% 43.30%  
Federal statutory rate 35.00%    
Foreign Tax Authority      
Income Tax Contingency [Line Items]      
Decrease in effective tax rate 11.70%    
Negative impact on effective tax rate     15.30%