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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 57,197 $ 68,092
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 16,919 18,700
Net realized investment losses (gains) 23,365 (28,904)
Bond amortization, net 5,714 3,981
Excess tax benefit from exercise of stock options (252) (116)
Increase in premiums receivables (10,674) (28,639)
Change in current and deferred income taxes (8,429) (13,878)
Increase in deferred policy acquisition costs (3,689) (7,685)
Decrease in unpaid losses and loss adjustment expenses (29,087) (6,958)
Increase in unearned premiums 17,683 39,014
Increase in accounts payable and accrued expenses 21,671 6,343
Share-based compensation (100) (85)
Changes in other payables 8,020 1,611
Other, net (1,880) (2,095)
Net cash provided by operating activities 96,458 49,381
CASH FLOWS FROM INVESTING ACTIVITIES    
Fixed maturities available-for-sale in nature: Purchases (430,984) (260,626)
Fixed maturities available-for-sale in nature: Sales 117,076 56,117
Fixed maturities available-for-sale in nature: Calls or maturities 163,734 189,772
Equity securities available-for-sale in nature:    
Purchases (326,896) (144,919)
Sales 322,250 75,024
Calls 0 923
Changes in securities payable and receivable 24,450 (3,348)
Net decrease in short-term investments 128,282 56,301
Purchase of fixed assets (8,361) (7,775)
Sale of fixed assets 453 1,393
Other, net 1,413 1,610
Net cash used in investing activities (8,583) (35,528)
CASH FLOWS FROM FINANCING ACTIVITIES    
Dividends paid to shareholders (67,303) (66,973)
Excess tax benefit from exercise of stock options 252 116
Proceeds from stock options exercised 1,324 2,098
Net cash used in financing activities (65,727) (64,759)
Net increase (decrease) in cash 22,148 (50,906)
Cash:    
Beginning of the year 158,183 211,393
End of period 180,331 160,487
SUPPLEMENTAL CASH FLOW DISCLOSURE    
Interest paid 582 927
Income taxes paid $ 17,266 $ 28,927