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Consolidated Statements of Cash Flow (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating Activities    
Net income $ 100,477 $ 81,083
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization 31,059 32,861
Sale of renewal rights (8,000) 0
Loss on disposal of discontinued operations 0 997
Stock-based compensation expense 7,421 7,428
Undistributed (gains) losses of equity method investments (131) 248
Net realized gains (26,988) (21,940)
Retirement income plan curtailment expense 0 16
Changes in assets and liabilities:    
Increase in reserve for loss and loss expenses, net of reinsurance recoverables 86,887 112,876
Increase in unearned premiums, net of prepaid reinsurance 68,935 120,288
Decrease in net federal income taxes 33,596 8,990
Increase in premiums receivable (66,816) (84,826)
Increase in deferred policy acquisition costs (16,700) (21,688)
Increase in interest and dividends due or accrued (82) (45)
(Decrease) increase in accrued salaries and benefits (13,958) 8,286
(Decrease) increase in accrued insurance expenses (12,545) 6,895
Other-net (25,036) (13,480)
Net adjustments 57,642 156,906
Net cash provided by operating activities 158,119 237,989
Investing Activities    
Purchase of fixed income securities, available-for-sale (560,493) (838,634)
Purchase of equity securities, available-for-sale (185,529) (112,742)
Purchase of other investments (8,498) (7,864)
Purchase of short-term investments (1,082,192) (1,619,948)
Sale of subsidiary 0 1,225
Sale of fixed income securities, available-for-sale 35,499 6,851
Sale of short-term investments 1,074,850 1,662,340
Redemption and maturities of fixed income securities, held-to-maturity 56,375 87,952
Redemption and maturities of fixed income securities, available-for-sale 336,939 413,722
Sale of equity securities, available-for-sale 186,001 109,399
Distributions from other investments 13,514 10,546
Purchase of property and equipment (9,178) (10,493)
Sale of renewal rights 8,000 0
Net cash used in investing activities (134,712) (297,646)
Financing Activities    
Dividends to stockholders (20,899) (20,532)
Acquisition of treasury stock (2,920) (3,295)
Net proceeds from stock purchase and compensation plans 3,554 4,305
Proceeds from issuance of notes payable, net of debt issuance costs 0 178,435
Repayment of notes payable 0 (100,000)
Excess tax benefits from share-based payment arrangements 1,024 1,479
Repayments of capital lease obligations (1,858) (768)
Net cash (used in) provided by financing activities (21,099) 59,624
Net increase (decrease) in cash 2,308 (33)
Cash, beginning of year 193 210
Cash, end of period $ 2,501 $ 177