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Consolidated Statements of Cashflow (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Operating Activities    
Net income $ 18,381 $ 21,967
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities [Abstract]    
Depreciation and amortization 19,550 16,261
Stock-based compensation expense 5,160 5,286
Undistributed losses (income) of equity method investments 496 (726)
Net realized gains (4,536) (7,906)
Changes in assets and liabilities:    
Increase in reserves for losses and loss expenses, net of reinsurance recoverables 19,802 49,164
Increase in unearned premiums, net of prepaid reinsurance and advance premiums 75,172 30,183
(Decrease) increase in net federal income taxes (3,058) 601
Increase in premiums receivable (57,294) (53,017)
Increase in deferred policy acquisition costs (16,638) (3,624)
(Increase) decrease in interest and dividends due or accrued (500) 514
Decrease in accrued salaries and benefits (5,699) (555)
Decrease in accrued insurance expenses (4,500) (7,045)
Other-net 5,823 8,694
Net adjustments 33,778 37,830
Net cash provided by operating activities 52,159 59,797
Investing Activities    
Purchase of fixed maturity securities, available-for-sale (426,346) (252,529)
Purchase of equity securities, available-for-sale (40,430) (123,141)
Purchase of other investments (6,355) (7,715)
Purchase of short-term investments (795,707) (694,764)
Purchase of subsidiary 255 0
Sale of subsidiary 445 670
Sale of fixed maturity securities, available-for-sale 37,699 64,104
Sale of short-term investments 876,928 713,111
Redemption and maturities of fixed maturity securities, held-to-maturity 57,152 99,560
Redemption and maturities of fixed maturity securities, available-for-sale 197,199 66,805
Sale of equity securities, available-for-sale 58,176 59,663
Distributions from other investments 8,442 14,046
Sale of other investments 1 16,357
Purchase of property and equipment (6,793) (2,843)
Net cash used in investing activities (39,334) (46,676)
Financing Activities    
Dividends to stockholders (13,442) (13,225)
Acquisition of treasury stock (3,102) (2,526)
Net proceeds from stock purchase and compensation plans 2,225 2,355
Excess tax benefits from share-based payment arrangements 873 (185)
Net cash used in financing activities (13,446) (13,581)
Net decrease in cash (621) (460)
Cash, beginning of year 762 645
Cash, end of period $ 141 $ 185