Nature of Operations and Basis of Presentation - Deferred Policy Acquisition Costs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 126,532
Underwriting costs deferred	227,010
Amortization of deferred policy acquisition costs	(204,504)
Recorded asset at September 30, 2024	$ 149,038