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Industry Segments (Financial Information of Company Operating Segments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Earned Premiums                 $ 5,226,537 $ 4,673,516 $ 4,160,867
Investment Income                 544,291 586,763 526,351
Other Revenues                 637,706 563,275 468,766
Total revenues 1,696,679 1,634,124 1,570,962 1,506,769 1,608,601 1,420,501 1,415,747 1,378,705 6,408,534 5,823,554 5,155,984
Pre-Tax Income (Loss)                 698,888 701,928 513,086
Net income to common stockholders 130,379 136,974 115,957 116,615 165,489 100,947 108,838 135,318 499,925 510,592 391,211
Net investment gains, before tax                 121,544 210,465 125,481
Net investment gains, net of tax                 74,118 136,802 81,647
Insurance-Domestic
                     
Segment Reporting Information [Line Items]                      
Earned Premiums                 3,782,416 3,417,022 3,121,281
Insurance-International
                     
Segment Reporting Information [Line Items]                      
Earned Premiums                 723,151 631,841 508,509
Reinsurance-Global
                     
Segment Reporting Information [Line Items]                      
Earned Premiums                 720,970 624,653 531,077
Operating Segments | Insurance-Domestic
                     
Segment Reporting Information [Line Items]                      
Earned Premiums                 3,782,416 3,417,022 3,121,281
Investment Income                 404,280 424,787 372,053
Other Revenues                 107,517 103,133 92,847
Total revenues                 4,294,213 3,944,942 3,586,181
Pre-Tax Income (Loss)                 648,740 578,500 467,126
Net income to common stockholders                 449,981 397,942 345,399
Operating Segments | Insurance-International
                     
Segment Reporting Information [Line Items]                      
Earned Premiums                 723,151 631,841 508,509
Investment Income                 47,039 45,796 36,958
Other Revenues                 0 0 0
Total revenues                 770,190 677,637 545,467
Pre-Tax Income (Loss)                 56,922 51,639 36,912
Net income to common stockholders                 40,292 35,928 28,142
Operating Segments | Reinsurance-Global
                     
Segment Reporting Information [Line Items]                      
Earned Premiums                 720,970 624,653 531,077
Investment Income                 89,090 106,932 97,795
Other Revenues                 0 0 0
Total revenues                 810,060 731,585 628,872
Pre-Tax Income (Loss)                 110,425 103,690 85,271
Net income to common stockholders                 78,013 72,916 66,405
Corporate, Other and Eliminations Segment
                     
Segment Reporting Information [Line Items]                      
Earned Premiums                 0 [1] 0 [1] 0 [1]
Investment Income                 3,882 [1] 9,248 [1] 19,545 [1]
Other Revenues                 408,645 [1] 249,677 [1] 250,438 [1]
Total revenues                 412,527 [1] 258,925 [1] 269,983 [1]
Pre-Tax Income (Loss)                 (238,743) [1] (242,366) [1] (201,704) [1]
Net income to common stockholders                 $ (142,479) [1] $ (132,996) [1] $ (130,382) [1]
[1] Corporate, other and eliminations represent corporate revenues and expenses and other items that are not allocated to business segments.