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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 68,092 $ 115,477
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]    
Depreciation and amortization 18,700 20,574
Net realized investment gains (28,904) (52,454)
Bond amortization, net 3,981 2,704
Excess tax benefit from exercise of stock options (116) (32)
Increase in premiums receivables (28,639) (6,026)
Change in current and deferred income taxes (13,878) 45,546
Increase in deferred policy acquisition costs (7,685) (973)
Decrease in unpaid losses and loss adjustment expenses (6,958) (53,221)
Increase in unearned premiums 39,014 13,861
Increase in accounts payable and accrued expenses 6,343 5,021
Share-based compensation (85) 314
Increase in other payables 1,611 2,113
Other, net (2,095) 154
Net cash provided by operating activities 49,381 93,058
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases (260,626) (183,740)
Sales 56,117 149,716
Calls or maturities 189,772 150,979
Equity securities available-for-sale in nature:    
Purchases (144,919) (230,301)
Sales 75,024 191,342
Calls 923 0
Net (decrease) increase in payable for securities (3,348) 14,595
Net decrease in short-term investments 56,301 3,826
Purchase of fixed assets (7,775) (9,584)
Sale of fixed assets 1,393 2,453
Other, net 1,610 6,436
Net cash (used in) provided by investing activities (35,528) 95,722
CASH FLOWS FROM FINANCING ACTIVITIES    
Dividends paid to shareholders (66,973) (65,784)
Excess tax benefit from exercise of stock options 116 32
Proceeds from stock options exercised 2,098 641
Net cash used in financing activities (64,759) (65,111)
Net (decrease) increase in cash (50,906) 123,669
Cash:    
Beginning of the year 211,393 181,388
End of period 160,487 305,057
SUPPLEMENTAL CASH FLOW DISCLOSURE    
Interest paid 927 3,282
Income taxes paid (received) $ 28,927 $ (8,499)