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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Cash Flow) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net cash provided by operating activities | $ 341,405 | $ 291,678 | $ 190,271
Fixed maturity securities available for sale in nature: |  |  |
Calls or maturities | 575,735 | 647,059 | 386,644
Equity securities available for sale in nature |  |  |
Purchases | (734,397) | (1,077,638) | (965,701)
Sales | 679,571 | 696,138 | 805,417
Business acquisition, net of cash acquired | 0 | 0 | 7,771
Other, net | 1,934 | 3,605 | 2,473
Net cash used in investing activities | (185,597) | (226,720) | (81,682)
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (137,886) | (137,201) | (136,386)
Employee taxes paid with shares related to share-based compensation | 0 | (3,292) | 0
Proceeds from stock options exercised | 2,162 | 1,632 | 2,111
Net proceeds from issuance of senior notes | 371,011 | 0 | 0
Payoff of principal on loan and credit facilities | (320,000) | 0 | 0
Proceeds from bank loan | 0 | 30,000 | 0
Net cash used in financing activities | (84,713) | (108,861) | (134,275)
Net increase (decrease) in cash | 71,095 | (43,903) | (25,686)
Cash: |  |  |
Beginning of year | 220,318 | 264,221 | 289,907
End of year | 291,413 | 220,318 | 264,221
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 9,863 | 3,531 | 2,989
Income taxes paid | 25,218 |  | 31,390
Income taxes (refunded) |  | (183) |
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net cash provided by operating activities | (14,503) | 4,731 | 575
Cash flows from investing activities: |  |  |
Capital contribution to subsidiaries | (140,125) | (30,125) | (90,125)
Distributions received from special purpose entities | 5,243 | 4,898 | 8,883
Dividends received from subsidiaries | 109,000 | 110,800 | 133,000
Fixed maturity securities available for sale in nature: |  |  |
Purchases | (188,467) | (1,060) | (571)
Sales | 165,944 | 0 | 0
Calls or maturities | 4,000 | 0 | 0
Equity securities available for sale in nature |  |  |
Purchases | 0 | (64,807) | (146,236)
Sales | 0 | 73,942 | 192,005
Net decrease in short-term investments | 0 | (515) | (8,612)
Business acquisition, net of cash acquired | 0 | 0 | (6,000)
Other, net | 310 | 1,614 | 1,945
Net cash used in investing activities | (44,095) | 95,777 | 101,513
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (137,886) | (137,201) | (136,386)
Employee taxes paid with shares related to share-based compensation | 0 | (3,292) | 0
Proceeds from stock options exercised | 2,162 | 1,632 | 2,111
Net proceeds from issuance of senior notes | 371,011 | 0 | 0
Payoff of principal on loan and credit facilities | (180,000) | 0 | 0
Proceeds from bank loan | 0 | 30,000 | 0
Net cash used in financing activities | 55,287 | (108,861) | (134,275)
Net increase (decrease) in cash | (3,311) | (8,353) | (32,187)
Cash: |  |  |
Beginning of year | 11,786 |  | 20,139
End of year | 8,475 | 11,786 |
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 9,435 | 2,397 | 2,153
Income taxes paid | $ (346) |  | $ 1,807
Income taxes (refunded) |  | $ 339 |

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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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 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=66902209&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 + Details
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