Profit Sharing Plan (Details) - Profit Sharing Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Profit Sharing Plan for Benefit of Employees [Abstract]
Requisite service period	12 months
Requisite service hours	1000 hours
Compensation expense	$ 2,104	$ 2,050	$ 1,525