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Industry Segments (Financial Information of Company Operating Segments) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Earned Premiums                 $ 6,311,419 $ 6,293,348 $ 6,040,609
Investment Income                 575,788 564,163 512,645
Other Income                 805 376 337
Total revenues $ 1,934,956 $ 2,031,342 $ 1,848,049 $ 1,870,418 $ 1,971,333 $ 2,019,727 $ 1,855,914 $ 1,807,211 7,684,764 7,654,184 7,206,457
Net income to common stockholders $ 154,589 $ 162,054 $ 109,004 $ 123,447 $ 152,790 $ 220,650 $ 108,967 $ 119,511 549,094 601,916 503,694
Insurance                      
Segment Reporting Information [Line Items]                      
Earned Premiums                 5,706,443 5,618,842 5,393,166
Reinsurance                      
Segment Reporting Information [Line Items]                      
Earned Premiums                 604,976 674,506 647,443
Net Investment Gains Segment [Member]                      
Segment Reporting Information [Line Items]                      
Earned Premiums                 0 0 0
Investment Income                 0 0 0
Other Income                 335,858 267,005 92,324
Investment Income, Net                 335,858 267,005 92,324
Income (Loss) from Subsidiaries, Net of Tax                 218,308 173,553 60,011
Pre-Tax Income (Loss)                 335,858 267,005 92,324
Premiums Receivable [Member]                      
Segment Reporting Information [Line Items]                      
Earned Premiums                 6,311,419 6,293,348 6,040,609
Investment Income [Member]                      
Segment Reporting Information [Line Items]                      
Investment Income                 575,788 564,163 512,645
Other funds                      
Segment Reporting Information [Line Items]                      
Other Revenues                 797,557 796,673 653,203
Operating Segments                      
Segment Reporting Information [Line Items]                      
Pre-Tax Income (Loss)                 772,770 896,438 732,030
Corporate and adjustments                      
Segment Reporting Information [Line Items]                      
Earned Premiums                 0 0 0
Investment Income                 48,464 30,057 27,962
Other Revenues                 374,835 431,789 464,392
Total revenues                 423,299 461,846 492,354
Pre-Tax Income (Loss)                 (303,965) (267,983) (231,739)
Net income to common stockholders                 (199,269) (174,650) (155,230)
Operating Segments                      
Segment Reporting Information [Line Items]                      
Net income to common stockholders                 549,094 601,916 503,694
Operating Segments | Insurance                      
Segment Reporting Information [Line Items]                      
Earned Premiums                 5,706,443 5,618,842 5,393,166
Investment Income                 436,178 431,489 386,801
Other Revenues                 86,864 97,879 96,487
Total revenues                 6,229,485 6,148,210 5,876,454
Pre-Tax Income (Loss)                 756,153 799,139 748,515
Net income to common stockholders                 535,186 534,613 512,426
Operating Segments | Reinsurance                      
Segment Reporting Information [Line Items]                      
Earned Premiums                 604,976 674,506 647,443
Investment Income                 91,146 102,617 97,882
Other Revenues                 0 0 0
Total revenues                 696,122 777,123 745,325
Pre-Tax Income (Loss)                 (15,276) 98,277 122,930
Net income to common stockholders                 $ (5,131) $ 68,400 $ 86,487