Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plans
Age of the full-time employees qualified to participate in the defined contribution plan	21 years
Expense related to savings plan recognized	$ 27.9	$ 18.2	$ 9.0
Maximum
Employee Benefit Plans
Matching contribution by employer as a percentage of employee's considered compensation	4.00%