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Reinsurance COVID 19 Impact (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
COVID 19 Impact [Line Items]        
Document Period End Date     Jun. 30, 2020  
Direct Premiums Written $ (834,643) $ (807,367) $ (1,581,074) $ (1,573,761)
Direct Premiums Earned (733,647) (740,348) (1,488,538) (1,468,385)
Direct Loss and Loss Expenses Incurred $ (451,013) $ (435,700) (876,808) $ (860,357)
Policyholder Premium Credit 15.00%      
Non Catastrophic Loss [Member]        
COVID 19 Impact [Line Items]        
Direct Loss and Loss Expenses Incurred     (6,400)  
COVID-19 [Member]        
COVID 19 Impact [Line Items]        
Direct Premiums Written $ (19,740)   (94,740)  
Direct Premiums Earned (51,564)   (68,073)  
Direct Loss and Loss Expenses Incurred (37,938)   (37,813)  
Return audit and midterm endorsement premium [Member] | COVID-19 [Member]        
COVID 19 Impact [Line Items]        
Direct Premiums Written 0   (75,000)  
Direct Premiums Earned (31,824)   (48,333)  
Direct Loss and Loss Expenses Incurred (18,198)   (28,073)  
Premium Credit [Member] | COVID-19 [Member]        
COVID 19 Impact [Line Items]        
Direct Premiums Written (19,740)   (19,740)  
Direct Premiums Earned (19,740)   (19,740)  
Direct Loss and Loss Expenses Incurred (19,740)   (19,740)  
COVID-19 [Member] | COVID-19 [Member]        
COVID 19 Impact [Line Items]        
Direct Premiums Written     0  
Direct Premiums Earned     0  
COVID-19 [Member] | Commercial Property [Member]        
COVID 19 Impact [Line Items]        
Direct Loss and Loss Expenses Incurred     (10,000)  
Commercial & Personal Automobile [Member] | Premium Credit [Member] | COVID-19 [Member]        
COVID 19 Impact [Line Items]        
Direct Premiums Written $ (19,700)      
Casualty Insurance Product Line [Member]        
COVID 19 Impact [Line Items]        
Direct Loss and Loss Expenses Incurred     (13,300)  
Return audit and midterm endorsement premium [Member] | COVID-19 [Member]        
COVID 19 Impact [Line Items]        
Direct Premiums Written     $ (75,000)