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Effects of Reinsurance on Premiums (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Insurance [Abstract]      
Direct Premiums Written $ 1,411,558 $ 1,278,504 $ 1,148,190
Assumed Premiums Written 45,305 101,764 104,211
Ceded Premiums Written (755,871) (633,275) (512,270)
Premiums Written, Net 700,992 746,993 740,131
Increase (Decrease) in Direct Unearned Premiums (66,483) (59,660) (49,048)
Increase (Decrease) in Assumed Unearned Premiums 16,600 12,918 (22,392)
Increase (Decrease) in Ceded Unearned Premiums 114,554 52,149 20,585
Increase (Decrease) in Unearned Premiums 64,671 5,407 (50,855)
Direct Premiums Earned, Property and Casualty 1,345,075 1,218,844 1,099,142
Assumed Premiums Earned, Property and Casualty 61,905 114,682 81,819
Ceded Premiums Earned (641,317) (581,126) (491,685)
Premiums Earned, Net 765,663 752,400 689,276
Direct Losses and LAE Incurred 1,186,401 1,003,767 1,101,328
Assumed Losses and LAE Incurred 67,119 44,914 97,444
Ceded Losses and LAE Incurred (645,204) (549,188) (790,183)
Net Losses and LAE Incurred $ 608,316 $ 499,493 $ 408,589