Insurance Operations - Statutory Capital and Surplus, and an Amount Representing Ten Percent of Total Liabilities for both UPCIC and APPCIC (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
UPCIC
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 362,828	$ 400,866
Ten percent of total liabilities	152,552	151,190
APPCIC
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	24,531	22,786
Ten percent of total liabilities	$ 2,463	$ 2,023