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Consolidated Statements Of Cash Flows (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 115,477 $ 78,996
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 20,574 17,081
Net realized investment (gains) losses (52,454) 5,669
Bond amortization (accretion), net 2,704 (1,201)
Excess tax benefit from exercise of stock options (32) (42)
Decrease (increase) in premiums receivable (6,026) (3,124)
Decrease in current and deferred income taxes 45,546 14,322
(Increase) decrease in deferred policy acquisition costs (973) 1,972
Decrease in unpaid losses and loss adjustment expenses (53,221) (53,557)
Increase in unearned premiums 13,861 313
Increase in accounts payable and accrued expenses 5,021 16,763
Share-based compensation 314 396
Increase (decrease) in other payables 2,113 (25,695)
Other, net 154 151
Net cash provided by operating activities 93,058 52,044
CASH FLOWS FROM INVESTING ACTIVITIES    
Fixed maturities available-for-sale in nature: Purchases (183,740) (188,227)
Sales 149,716 74,220
Calls or maturities 150,979 150,636
Equity securities available-for-sale in nature:    
Purchases (230,301) (105,791)
Sales 191,342 75,411
Net increase in payable for securities 14,595 135
Net decrease in short-term investments 3,826 51,743
Purchase of fixed assets (9,584) (15,307)
Sale and write-off of fixed assets 2,453 66
Other, net 6,436 3,165
Net cash provided by investing activities 95,722 46,051
CASH FLOWS FROM FINANCING ACTIVITIES    
Dividends paid to shareholders (65,784) (64,651)
Excess tax benefit from exercise of stock options 32 42
Proceeds from stock options exercised 641 475
Net cash used in financing activities (65,111) (64,134)
Net increase in cash 123,669 33,961
Cash:    
Beginning of the year 181,388 185,505
End of year 305,057 219,466
SUPPLEMENTAL CASH FLOW DISCLOSURE    
Interest paid 3,282 3,257
Income taxes (received) paid (8,499) 3,330
Net realized gains from sale of investments $ 11,313 $ 4,978