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Business Segments (Financial Information of Company Operating Segments) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Segment Reporting [Abstract]    
Number of reportable segments | segment 2  
Segment Reporting Information [Line Items]    
Earned Premiums (1) $ 1,849,956 $ 1,691,418
Investment Income  158,577 174,763
Other 148,336 (55,571)
Total revenues 2,156,869 1,810,610
Pre-Tax Income (Loss) 296,068 (6,468)
Net Income (Loss) to Common Stockholders 229,525 (4,418)
Net investment gains 34,839 (177,174)
Net investment gains, net of tax 28,952 (139,967)
Corporate, other and eliminations    
Segment Reporting Information [Line Items]    
Earned Premiums (1) 0 0
Investment Income  15,632 13,595
Other 105,218 113,130
Total revenues 120,850 126,725
Pre-Tax Income (Loss) (64,529) (41,755)
Net Income (Loss) to Common Stockholders (52,606) (33,755)
Insurance    
Segment Reporting Information [Line Items]    
Earned Premiums (1)   1,484,955
Insurance | Operating Segments    
Segment Reporting Information [Line Items]    
Earned Premiums (1) 1,604,979 1,484,955
Investment Income  105,237 123,458
Other 8,279 8,473
Total revenues 1,718,495 1,616,886
Pre-Tax Income (Loss) 257,109 175,947
Net Income (Loss) to Common Stockholders 198,708 140,117
Reinsurance & Monoline Excess    
Segment Reporting Information [Line Items]    
Earned Premiums (1)   206,463
Reinsurance & Monoline Excess | Operating Segments    
Segment Reporting Information [Line Items]    
Earned Premiums (1) 244,977 206,463
Investment Income  37,708 37,710
Other 0 0
Total revenues 282,685 244,173
Pre-Tax Income (Loss) 68,649 36,514
Net Income (Loss) to Common Stockholders 54,471 29,187
Re-insurance - International | Operating Segments    
Segment Reporting Information [Line Items]    
Total revenues 88,000 69,000
Net investment gains    
Segment Reporting Information [Line Items]    
Earned Premiums (1) 0 0
Investment Income  0 0
Insurance-International Segment | Operating Segments    
Segment Reporting Information [Line Items]    
Total revenues $ 196,000 $ 168,000