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Condensed Financial Information Of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Cash Flow) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net cash (used in) provided by operating activities $ 158,525 $ 91,781 $ 189,025
Fixed maturities:      
Calls or maturities 418,616 285,454 218,037
Equity securities:      
Purchases (379,963) (432,869) (430,692)
Sales 325,562 240,764 337,018
Calls 0 4,826 0
Net decrease in payable for securities (9,137) 10,763 1,192
Net (increase) decrease in short-term investments (93,737) 12,815 48,718
Other, net 12,026 6,868 2,690
Net cash provided by (used in) investing activities 124,615 33,100 (31,697)
Cash flows from financing activities:      
Dividends paid to shareholders (132,142) (129,863) (127,617)
Excess tax benefit from exercise of stock options 56 132 5
Proceeds from stock options exercised 1,951 733 393
Net cash used in financing activities (253,135) (128,998) (7,219)
Net increase (decrease) in cash 30,005 (4,117) 150,109
Cash:      
Beginning of year 181,388 185,505 35,396
End of year 211,393 181,388 185,505
Parent Company [Member]
      
Cash flows from operating activities:      
Net cash (used in) provided by operating activities (312) (4,441) 19,094
Cash flows from investing activities:      
Dividends from subsidiaries 270,000 128,000 110,000
Fixed maturities:      
Calls or maturities   265 320
Equity securities:      
Purchases (50,056) (836) (8,021)
Sales 43,520 2,070 6,486
Calls   895  
Net decrease in payable for securities     (1,719)
Net (increase) decrease in short-term investments (21,451) (583) 47,274
Other, net 1,047 (110) (3,260)
Net cash provided by (used in) investing activities 243,060 129,701 151,080
Cash flows from financing activities:      
Dividends paid to shareholders (132,142) (129,863) (127,617)
Excess tax benefit from exercise of stock options 56 132 5
Proceeds from stock options exercised 1,951 733 393
Payment to retire senior notes (125,000)    
Net cash used in financing activities (255,135) (128,998) (127,219)
Net increase (decrease) in cash (12,387) (3,738) 42,955
Cash:      
Beginning of year 41,606 45,344 2,389
End of year $ 29,219 $ 41,606 $ 45,344