Reinsurance - Excess of Loss Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Home Re 2018-1
Effects of Reinsurance [Line Items]
Remaining First Layer Retention	$ 167,779	$ 168,691
Remaining Excess of Loss Reinsurance Coverages	260,957	318,636
Home Re 2019-1
Effects of Reinsurance [Line Items]
Remaining First Layer Retention	185,636	0
Remaining Excess of Loss Reinsurance Coverages	271,021	0
Home Re special purpose insurers
Effects of Reinsurance [Line Items]
Remaining First Layer Retention	353,415	168,691
Remaining Excess of Loss Reinsurance Coverages	$ 531,978	$ 318,636