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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 116,911 $ 191,164 $ 152,198
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 36,974 40,657 40,735
Net realized investment gains (66,380) (58,397) (57,089)
Bond amortization, net 6,757 4,615 1,062
Excess tax benefit from exercise of stock options (86) (56) (132)
Increase in premiums receivable (56,588) (7,819) (4,192)
Changes in current and deferred income taxes (83) 45,431 11,399
(Increase) decrease in deferred policy acquisition costs (14,480) (851) 5,287
Increase (decrease) in unpaid losses and loss adjustment expenses 50,844 (48,926) (19,129)
Increase (decrease) in unearned premiums 77,002 10,048 (11,161)
Increase (decrease) in accounts payable and accrued expenses 1,197 (9,985) (9,054)
Share-based compensation (370) 899 812
Increase (decrease) in other payables 2,545 (4,142) (23,186)
Other, net (6,181) (4,113) 4,231
Net cash provided by operating activities 148,062 158,525 91,781
CASH FLOWS FROM INVESTING ACTIVITIES      
Fixed maturity securities available-for-sale in nature: Purchases (590,562) (379,963) (432,869)
Fixed maturity securities available-for-sale in nature: Sales 139,860 217,535 204,543
Fixed maturity securities available-for-sale in nature: Calls or maturities 528,886 418,616 285,454
Equity securities available for sale in nature:      
Purchases (358,216) (351,198) (272,519)
Sales 277,272 325,562 240,764
Calls 923 0 4,826
Changes in securities payable and receivable 1,919 (9,137) 10,763
Net (increase) decrease in short-term investments (58,949) (93,737) 12,815
Purchase of fixed assets (15,177) (18,079) (28,886)
Sale of fixed assets 2,044 2,990 1,341
Other, net 2,255 12,026 6,868
Net cash (used in) provided by investing activities (69,745) 124,615 33,100
CASH FLOWS FROM FINANCING ACTIVITIES      
Dividends paid to shareholders (134,105) (132,142) (129,863)
Excess tax benefit from exercise of stock options 86 56 132
Payment to retire senior notes 0 (125,000) 0
Payoff bank loan 0 (18,000) 0
Proceeds from stock options exercised 2,492 1,951 733
Proceeds from bank loan 0 20,000 0
Net cash used in financing activities (131,527) (253,135) (128,998)
Net (decrease) increase in cash (53,210) 30,005 (4,117)
Cash:      
Beginning of year 211,393 181,388 185,505
End of year 158,183 211,393 181,388
SUPPLEMENTAL CASH FLOW DISCLOSURE      
Interest paid 1,690 6,193 6,607
Income taxes paid $ 18,481 $ 8,503 $ 18,792