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Property and Equipment, Net (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Property Plant And Equipment [Abstract]        
Depreciation Expense $ 5.4 $ 4.9 $ 10.0 $ 9.2