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Consolidated Statements of Cash Flow (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating Activities    
Net income $ 81,083 $ 36,655
Adjustments to Reconcile Net Income to net Cash Provided by Operating Activities [Abstract]    
Depreciation and amortization 32,861 29,386
Loss on disposal of discontinued operations 997 0
Stock-based compensation expense 7,428 6,263
Undistributed losses of equity method investments 248 1,090
Net realized gains (21,940) (3,448)
Retirement income plan curtailment expense 16 0
Changes in assets and liabilities:    
Increase in reserve for loss and loss expenses, net of reinsurance recoverables 112,876 37,463
Increase in unearned premiums, net of prepaid reinsurance and advance premiums 120,667 119,269
Decrease (increase) in net federal income taxes 8,990 (1,050)
Increase in premiums receivable (84,826) (53,659)
Increase in deferred policy acquisition costs (21,688) (25,744)
(Decrease) Increase in interest and dividends due or accrued (45) 721
Increase in accrued salaries and benefits 8,286 5,365
Increase in accrued insurance expenses 6,895 299
Other-net (13,859) 15,144
Net adjustments 156,906 131,099
Net Cash Provided by Operating Activities 237,989 167,754
Investing Activities    
Purchase of fixed maturity securities, available-for-sale (838,634) (676,408)
Purchase of equity securities, available-for-sale (112,742) (41,004)
Purchase of other investments (7,864) (9,050)
Purchase of short-term investments (1,619,948) (1,231,519)
Purchase of subsidiary 0 255
Sale of subsidiary 1,225 600
Sale of fixed maturity securities, available-for-sale 6,851 92,170
Sale of short-term investments 1,662,340 1,263,684
Redemption and maturities of fixed maturity securities, held-to-maturity 87,952 91,665
Redemption and maturities of fixed maturity securities, available-for-sale 413,722 297,980
Sale of equity securities, available-for-sale 109,399 58,749
Distributions from other investments 10,546 13,910
Sale of Other Investments 0 1
Purchase of property and equipment (10,493) (9,382)
Net Cash Used in Investing Activities (297,646) (148,349)
Financing Activities    
Dividends to stockholders (20,532) (20,188)
Acquisition of treasury stock (3,295) (3,154)
Net proceeds from stock purchase and compensation plans 4,305 2,586
Proceeds from issuance of notes payable, net of debt issuance costs 178,435 0
Repayment of notes payable (100,000) 0
Excess tax benefits from share-based payment arrangements 1,479 904
Repayments of capital lease obligations (768) 0
Net cash provided by (used in) financing activities 59,624 (19,852)
Net decrease in cash (33) (447)
Cash, beginning of year 210 762
Cash, end of period $ 177 $ 315