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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
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |
Net cash provided by (used in) operating activities | $ 287,473 | $ 190,244 | $ 246,535
Equity securities available for sale in nature |  |  |
Purchases | (1,077,638) | (965,701) | (542,494)
Sales | 696,138 | 805,417 | 745,058
(Decrease) in payable for securities, net | 29,958 | (1,387) | 9,294
Business acquisition, net of cash acquired | 0 | 7,771 | 0
Other, net | 3,605 | 2,473 | 3,472
Net cash used in investing activities | (226,720) | (81,682) | (194,035)
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (137,201) | (136,386) | (135,496)
Excess tax benefits related to share-based compensation | 913 | 27 | 148
Proceeds from stock options exercised | 1,632 | 2,111 | 6,247
Proceeds from bank loan | 30,000 | 0 | 100,000
Net cash used in financing activities | (104,656) | (134,248) | (29,101)
Net increase (decrease) in cash | (43,903) | (25,686) | 23,399
Cash: |  |  |
Beginning of year | 264,221 | 289,907 | 266,508
End of year | 220,318 | 264,221 | 289,907
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 3,531 | 2,989 | 2,543
Income taxes (refunded) | (183) |  |
Income taxes paid |  | 31,390 | 61,139
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net cash provided by (used in) operating activities | 526 | 548 | (3,434)
Cash flows from investing activities: |  |  |
Capital contribution to subsidiaries | (30,125) | (90,125) | (30,125)
Distributions received from special purpose entities | 4,898 | 8,883 | 6,756
Dividends received from subsidiaries | 110,800 | 133,000 | 225,000
Purchases of fixed maturity securities available for sale in nature | (1,060) | (571) | 0
Equity securities available for sale in nature |  |  |
Purchases | (64,807) | (146,236) | (254,572)
Sales | 73,942 | 192,005 | 90,422
(Decrease) in payable for securities, net | 0 | 0 | (2,489)
Net decrease in short-term investments | (515) | (8,612) | (1,346)
Business acquisition, net of cash acquired | 0 | (6,000) |
Other, net | 1,614 | 1,945 | 2,191
Net cash used in investing activities | 95,777 | 101,513 | 38,529
Cash flows from financing activities: |  |  |
Dividends paid to shareholders | (137,201) | (136,386) | (135,496)
Excess tax benefits related to share-based compensation | 913 | 27 | 148
Proceeds from stock options exercised | 1,632 | 2,111 | 6,247
Proceeds from bank loan | 30,000 | 0 | 100,000
Net cash used in financing activities | (104,656) | (134,248) | (29,101)
Net increase (decrease) in cash | (8,353) | (32,187) | 5,994
Cash: |  |  |
Beginning of year | 20,139 | 52,326 | 46,332
End of year | 11,786 | 20,139 | 52,326
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |  |
Interest paid | 2,397 | 2,153 | 1,757
Income taxes (refunded) | $ (339) |  |
Income taxes paid |  | $ 1,807 | $ 2,112

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