Reinsurance and Policy Benefits and Losses Claims and Loss Expenses Payable (Policy Benefits and Losses, Claims and Loss Expenses Payable for Property and Casualty Insurance) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reinsurance:
Unpaid losses and loss adjustment expense		$ 209,127
Total	$ 997,647		$ 1,011,183
Property and Casualty Insurance [Member]
Reinsurance:
Unpaid losses and loss adjustment expense		209,127		$ 228,970	$ 233,554	$ 244,400
Operating Segments [Member] | Property and Casualty Insurance [Member]
Reinsurance:
Unpaid losses and loss adjustment expense		209,127		228,970
Reinsurance losses payable		1,214		988
Total	$ 210,341	$ 210,341	$ 229,958	$ 229,958