Nature of Operations and Basis of Presentation - Deferred Policy Acquisition Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 91,446
Underwriting costs deferred	54,787
Amortization of deferred policy acquisition costs	(50,471)
Recorded asset at ending of period	$ 95,762