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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 66,461 $ 73,356
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,817 9,516
Net realized investment gains (44,050) (52,663)
Bond amortization, net 2,735 1,545
Excess tax benefit from exercise of stock options 0 (32)
Increase in premiums receivables (22,916) (21,111)
Change in current and deferred income taxes 24,094 21,683
Increase in deferred policy acquisition costs (4,934) (3,962)
Decrease in unpaid losses and loss adjustment expenses (26,705) (30,893)
Increase in unearned premiums 27,944 22,555
Increase in accounts payable and accrued expenses 17,660 6,017
Share-based compensation 29 95
Change in other payables (417) 3,548
Other, net 9,480 5,029
Net cash provided by operating activities 58,198 34,683
CASH FLOWS FROM INVESTING ACTIVITIES    
Fixed maturities available-for-sale in nature: Purchases (209,768) (129,573)
Fixed maturities available-for-sale in nature: Sales 9,568 35,816
Fixed maturities available-for-sale in nature: Calls or maturities 81,541 73,292
Equity securities available-for-sale in nature:    
Purchases (168,328) (40,344)
Sales 160,997 43,869
Calls 0 923
Changes in securities payable and receivable (10,449) 275
Net decrease in short-term investments 142,368 9,056
Purchase of fixed assets (4,501) (4,152)
Sale of fixed assets 147 833
Other, net 727 1,004
Net cash provided by (used in) investing activities 2,302 (9,001)
CASH FLOWS FROM FINANCING ACTIVITIES    
Dividends paid to shareholders (33,641) (33,478)
Excess tax benefit from exercise of stock options 0 32
Proceeds from stock options exercised 0 1,072
Net cash used in financing activities (33,641) (32,374)
Net increase (decrease) in cash 26,859 (6,692)
Cash:    
Beginning of the year 158,183 211,393
End of period 185,042 204,701
SUPPLEMENTAL CASH FLOW DISCLOSURE    
Interest paid 368 539
Income taxes paid $ 439 $ 6,954