Employee Benefits - Deferral Percentages (Details)	12 Months Ended
	Dec. 31, 2019 plan
Employee Benefits
Number of employee retirement plans	2
401K Plan
Employee Benefits
Company contribution percentage of amounts deferred by employee's up to 3% of compensation	100.00%
Company contribution percentage of amounts deferred by employee's between 3%-6% of compensation	50.00%
401K Plan | Minimum
Employee Benefits
Percentage of eligible compensation	3.00%
401K Plan | Maximum
Employee Benefits
Percentage of eligible compensation	6.00%