Accounting Policies - Discontinued Operations and Held for Sale Classification (Details) $ in Thousands	Oct. 07, 2022 USD ($) employee item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Discontinued Operations and Held for Sale Classification
Reserves for unpaid losses and loss adjustment expenses		$ 880,869	$ 816,681
Discontinued Operations, Held-for-sale or disposed of by sale | E&S [Member]
Discontinued Operations and Held for Sale Classification
Cash consideration	$ 40,000
Acquisition costs	19,900
Reserves for unpaid losses and loss adjustment expenses	$ 200,100
Number of business units | item	9
Number of employees | employee	200