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Investments (Summarized Financial Information for Significant Investment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]        
Net Investment Income $ 21,944 $ 17,417 $ 42,387 $ 32,434
Total net investment gains (losses) (23,884) 10,833 (37,390) 19,682
Net gain (loss) attributable to proassurance $ (1,659) $ 92,050 (5,219) 99,785
Significant Equity Method Investees        
Schedule of Equity Method Investments [Line Items]        
Net Investment Income     11,049 (2,836)
Net investment gains (losses)     78,586 6,398
Net change in unrealized appreciation (depreciation)     190,089 142,473
Operating Expenses     2,656 3,432
Total net investment gains (losses)     277,068 142,603
Net gain (loss) attributable to proassurance     $ 1,370 $ 835