Profit Sharing Plan (Details) - Profit Sharing Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Profit Sharing Plan for Benefit of Employees [Abstract]
Requisite service hours	1000 hours
Compensation expense	$ 1,786	$ 2,230	$ 2,104
Required employment period for making contribution	90 days