Reinsurance (Details 5) $ in Thousands	Mar. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Total VIE Assets	$ 1,397,683
Maximum Exposure to Loss, On - Balance Sheet	(5,961)
Maximum Exposure to Loss, Off - Balance Sheet	10,816
Maximum Exposure to Loss	4,855
Radnor Re 2018-1 Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets	280,180
Maximum Exposure to Loss, On - Balance Sheet	169
Maximum Exposure to Loss, Off - Balance Sheet	1,580
Maximum Exposure to Loss	1,749
Radnor Re 2019-1 Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets	377,509
Maximum Exposure to Loss, On - Balance Sheet	(2,441)
Maximum Exposure to Loss, Off - Balance Sheet	1,967
Maximum Exposure to Loss	(474)
Radnor Re 2019-2 Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets	244,105
Maximum Exposure to Loss, On - Balance Sheet	(1,771)
Maximum Exposure to Loss, Off - Balance Sheet	1,210
Maximum Exposure to Loss	(561)
Radnor Re 2020-1 Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets	495,889
Maximum Exposure to Loss, On - Balance Sheet	(1,918)
Maximum Exposure to Loss, Off - Balance Sheet	6,059
Maximum Exposure to Loss	$ 4,141