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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property Plant And Equipment [Abstract]        
Depreciation expense $ 8.4 $ 7.4 $ 15.1 $ 14.1