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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 124,538 | $ 131,896 | $ 140,947
Net realized investment (losses) gains |  |  |  |  |  |  |  |  | (11,422) | 66,380 | 58,397
Total revenues |  |  |  |  |  |  |  |  | 2,821,041 | 2,783,370 | 2,777,285
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 219,478 | 207,281 | 215,711
Other operating expenses |  |  |  |  |  |  |  |  | 1,260 | 1,543 | 5,549
Total expenses |  |  |  |  |  |  |  |  | 2,688,945 | 2,648,060 | 2,532,186
Income before income taxes | 11,268 | 54,793 | (24,959) | 90,994 | (39,161) | 91,330 | (18,853) | 101,994 | 132,096 | 135,310 | 245,099
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 19,953 | 18,399 | 53,935
Net income | 15,376 | 39,570 | (9,264) | 66,461 | (17,382) | 66,201 | (5,264) | 73,356 | 112,143 | 116,911 | 191,164
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,293 | 1,114 | 1,411
Net realized investment (losses) gains |  |  |  |  |  |  |  |  | 3,416 | 697 | (1,866)
Total revenues |  |  |  |  |  |  |  |  | 4,709 | 1,811 | (455)
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 2,924 | 1,688 | 2,267
Other operating expenses |  |  |  |  |  |  |  |  | 318 | 0 | 1,341
Total expenses |  |  |  |  |  |  |  |  | 3,242 | 1,688 | 3,608
Income before income taxes |  |  |  |  |  |  |  |  | 1,467 | 123 | (4,063)
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 3,310 | 1,800 | (684)
Loss before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (1,843) | (1,677) | (3,379)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 113,986 | 118,588 | 194,543
Net income |  |  |  |  |  |  |  |  | $ 112,143 | $ 116,911 | $ 191,164

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