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Property and Equipment, Net (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Property Plant And Equipment [Abstract]        
Depreciation Expense $ 18.5 $ 5.4 $ 39.4 $ 10.0