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Reconciliation of Income Tax Rate (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Effective Income Tax Rate [Abstract]        
Effective Income Tax Rate Reconciliation, Percent 18.80% 8.80% 21.70% 20.80%