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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Cash Flow) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net cash used in operating activities | $ 148,062,000 | $ 158,525,000 | $ 91,781,000
Fixed maturity securities: |  |  |
Calls or maturities | 528,886,000 | 418,616,000 | 285,454,000
Equity securities: |  |  |
Purchases | (590,562,000) | (379,963,000) | (432,869,000)
Sales | 277,272,000 | 325,562,000 | 240,764,000
Calls | 923,000 | 0 | 4,826,000
Net (increase) decrease in short-term investments | (58,949,000) | (93,737,000) | 12,815,000
Other, net | 2,255,000 | 12,026,000 | 6,868,000
Net cash (used in) provided by investing activities | (69,745,000) | 124,615,000 | 33,100,000
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (134,105,000) | (132,142,000) | (129,863,000)
Excess tax benefit from exercise of stock options | 86,000 | 56,000 | 132,000
Payment to retire senior notes | 0 | (125,000,000) | 0
Proceeds from stock options exercised | 2,492,000 | 1,951,000 | 733,000
Net cash used in financing activities | (131,527,000) | (253,135,000) | (128,998,000)
Net (decrease) increase in cash | (53,210,000) | 30,005,000 | (4,117,000)
Cash: |  |  |
Beginning of year | 211,393,000 | 181,388,000 | 185,505,000
End of year | 158,183,000 | 211,393,000 | 181,388,000
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 1,690,000 | 6,193,000 | 6,607,000
Income taxes paid (received) | 18,481,000 | 8,503,000 | 18,792,000
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net cash used in operating activities | (5,590,000) | (312,000) | (4,441,000)
Cash flows from investing activities: |  |  |
Dividends from subsidiaries | 145,000,000 | 270,000,000 | 128,000,000
Fixed maturity securities: |  |  |
Calls or maturities | 0 | 0 | 265,000
Equity securities: |  |  |
Purchases | (14,102,000) | (50,056,000) | (836,000)
Sales | 7,308,000 | 43,520,000 | 2,070,000
Calls | 0 | 0 | 895,000
Net (increase) decrease in short-term investments | (20,413,000) | (21,451,000) | (583,000)
Other, net | 304,000 | 1,047,000 | (110,000)
Net cash (used in) provided by investing activities | 118,097,000 | 243,060,000 | 129,701,000
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (134,105,000) | (132,142,000) | (129,863,000)
Excess tax benefit from exercise of stock options | 86,000 | 56,000 | 132,000
Payment to retire senior notes | 0 | (125,000,000) | 0
Proceeds from stock options exercised | 2,492,000 | 1,951,000 | 733,000
Net cash used in financing activities | (131,527,000) | (255,135,000) | (128,998,000)
Net (decrease) increase in cash | (19,020,000) | (12,387,000) | (3,738,000)
Cash: |  |  |
Beginning of year | 29,219,000 | 41,606,000 | 45,344,000
End of year | 10,199,000 | 29,219,000 | 41,606,000
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 0 | 1,932,000 | 1,972,000
Income taxes paid (received) | $ 4,667,000 | $ (1,252,000) | $ (8,755,000)

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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