Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Minimum employee contribution amount, percentage of gross compensation	1.00%
Maximum employee contribution amount, percentage of gross compensation	100.00%
Employee matching contribution, percentage of employee gross compensation	4.00%
Plan expense	$ 479	$ 432	$ 405