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Property and Equipment, Net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 7.5 $ 7.7 $ 21.6 $ 21.1