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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 73,356 $ 58,226
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,516 10,420
Net realized investment gains (52,663) (28,690)
Bond amortization, net 1,545 1,277
Excess tax benefit from exercise of stock options (32) (20)
Increase in premiums receivables (21,111) (15,341)
Change in current and deferred income taxes 21,683 18,277
Increase in deferred policy acquisition costs (3,962) (66)
Decrease in unpaid losses and loss adjustment expenses (30,893) (43,486)
Increase in unearned premiums 22,555 19,735
Increase (decrease) in accounts payable and accrued expenses 6,017 (5,411)
Share-based compensation 95 116
Increase in other payables 3,548 9,195
Other, net 5,029 11,344
Net cash provided by operating activities 34,683 35,576
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases (129,573) (57,182)
Sales 35,816 96,707
Calls or maturities 73,292 82,925
Equity securities available-for-sale in nature:    
Purchases (40,344) (125,551)
Sales 43,869 125,673
Calls 923 0
Net increase (decrease) in payable for securities 275 (3,264)
Net decrease in short-term investments 9,056 31,760
Purchase of fixed assets (4,152) (5,956)
Sale of fixed assets 833 554
Other, net 1,004 4,033
Net cash (used in) provided by investing activities (9,001) 149,699
CASH FLOWS FROM FINANCING ACTIVITIES    
Dividends paid to shareholders (33,478) (32,891)
Excess tax benefit from exercise of stock options 32 20
Proceeds from stock options exercised 1,072 498
Net cash used in financing activities (32,374) (32,373)
Net (decrease) increase in cash (6,692) 152,902
Cash:    
Beginning of the year 211,393 181,388
End of period 204,701 334,290
SUPPLEMENTAL CASH FLOW DISCLOSURE    
Interest paid 539 2,129
Income taxes paid $ 6,954 $ 409