Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Insurance [Abstract]
Reinsurance Retention Policy, Excess Retention, Amount Reinsured	$ 3,200,000
Insurance Commissions and Fees, Flood Program		$ 1,506	$ 1,575	$ 1,255
Percentage of Flood Premiums Ceded		100.00%
Increase (Decrease) in Ceded Losses and LAE Incurred		$ 240,995
Losses ceded under aggregate contract		$ 26,488