Employee Benefit Plans (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended	12 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Maximum employees’ base compensation					3.00%
Employer match percent	50.00%
Employer matching contributions		$ 0.9	$ 0.5	$ 1.8	$ 0.9