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Net Income Per Share (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]        
Interest expense $ 4.7 $ 4.8 $ 14.8 $ 14.6