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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, 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