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Employees' Profit Sharing Plan (Details) - Deferred profit sharing plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employees' profit sharing plan      
Minimum period of continuous employment to be fully vested 1 year    
Profit sharing costs $ 4,200 $ 3,850 $ 3,750