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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | --- | ---
Investments, at fair value: |  |  |  |  |
Equity securities | $ 281,883 | $ 477,088 |  |  |
Short-term investments | 315,776 | 294,653 |  |  |
Total investments | 3,158,312 | 3,180,095 |  |  |
Cash | 266,508 | 158,183 |  | 211,393 | 181,388
Accrued investment income | 36,120 | 31,109 |  |  |
Current income taxes | 0 | 7,058 |  |  |
Deferred income taxes | 15,220 | 0 |  |  |
Other assets | 14,336 | 11,863 |  |  |
Total assets | 4,315,181 | 4,189,686 |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |
Notes payable | 190,000 | 140,000 |  |  |
Accounts payable and accrued expenses | 127,663 | 96,220 |  |  |
Current income taxes | 11,856 | 0 |  |  |
Deferred income taxes | 0 | 445 |  |  |
Other liabilities | 170,665 | 153,972 |  |  |
Total liabilities | 2,492,695 | 2,347,189 |  |  |
Shareholders’ equity: |  |  |  |  |
Common stock | 81,591 | 79,380 |  |  |
Additional paid -in capital | 411 | 0 |  |  |
Retained earnings | 1,740,484 | 1,763,117 |  |  |
Total shareholders’ equity | 1,822,486 | 1,842,497 | 1,857,483 |  |
Total liabilities and shareholders’ equity | 4,315,181 | 4,189,686 |  |  |
Parent Company [Member] |  |  |  |  |
Investments, at fair value: |  |  |  |  |
Equity securities | 29,737 | 27,127 |  |  |
Short-term investments | 11,089 | 47,174 |  |  |
Investment in subsidiaries | 1,794,164 | 1,760,760 |  |  |
Total investments | 1,834,990 | 1,835,061 |  |  |
Cash | 46,332 | 10,199 | 29,219 | 41,606 |
Accrued investment income | 16 | 4 |  |  |
Amounts receivable from affiliates | 206 | 200 |  |  |
Current income taxes | 0 | 6,333 |  |  |
Deferred income taxes | 1,068 | 729 |  |  |
Income tax receivable from affiliates | 11,573 | 6,182 |  |  |
Other assets | 459 | 0 |  |  |
Total assets | 1,894,644 | 1,858,708 |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |
Notes payable | 50,000 | 0 |  |  |
Accounts payable and accrued expenses | 23 | 47 |  |  |
Amounts payable to affiliates | 34 | 95 |  |  |
Income tax payable to affiliates | 6,730 | 16,069 |  |  |
Current income taxes | 12,672 | 0 |  |  |
Other liabilities | 2,699 | 0 |  |  |
Total liabilities | 72,158 | 16,211 |  |  |
Shareholders’ equity: |  |  |  |  |
Common stock | 81,591 | 79,380 |  |  |
Additional paid -in capital | 411 | 0 |  |  |
Retained earnings | 1,740,484 | 1,763,117 |  |  |
Total shareholders’ equity | 1,822,486 | 1,842,497 |  |  |
Total liabilities and shareholders’ equity | 1,894,644 | 1,858,708 |  |  |
Equity securities trading - cost | 27,499 | 31,178 |  |  |
Short-term investments - cost | $ 11,089 | $ 47,174 |  |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568447-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4590271-111686 + Details
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- Definition Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Cost of investments in equity securities and other forms of securities that provide ownership interests classified as trading. + References No definition available. + Details
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- Definition Amortized cost of short-term investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References No definition available. + Details
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