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Employee Benefit Plan (Details) - USD ($) $ in Thousands	12 Months Ended
Employee Benefit Plan (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plan
Minimum age required to be eligible for contribution under the Retirement Plan	21 years
Employer matching contribution (as a percent)	100.00%
Maximum amount contributed by employee from employees base salary (as a percent)	8.00%
Compensation expense	$ 3,365	$ 3,302	$ 3,164