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Consolidated Statements of Cash Flow (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating Activities    
Net income $ 17,974 $ 21,308
Adjustments to Reconcile Net Income to net Cash Provided by Operating Activities [Abstract]    
Depreciation and amortization 10,578 13,148
Sale of renewal rights (8,000) 0
Loss on disposal of discontinued operations 0 997
Stock-based compensation expense 4,176 3,692
Undistributed (gains) losses of equity method investments (33) 426
Net realized gains (7,218) (3,355)
Retirement income plan curtailment expense 0 16
Changes in assets and liabilities:    
Increase in reserve for loss and loss expenses, net of reinsurance recoverables 58,938 38,556
Increase in unearned premiums, net of prepaid reinsurance and advance premiums 19,875 30,106
Decrease in net federal income taxes 4,332 5,290
Increase in premiums receivable (29,042) (36,202)
Increase in deferred policy acquisition costs (4,697) (2,963)
Decrease in interest and dividends due or accrued 414 384
Decrease in accrued salaries and benefits (21,869) (4,528)
Decrease in accrued insurance expenses (26,957) (12,378)
Other-net 17,293 (26,357)
Net adjustments 17,790 6,832
Net cash provided by operating activities 35,764 28,140
Investing Activities    
Purchase of fixed income securities, available-for-sale (182,809) (308,289)
Purchase of equity securities, available-for-sale (61,360) (2)
Purchase of other investments (4,615) (2,329)
Purchase of short-term investments (398,348) (644,274)
Sale of subsidiary 0 225
Sale of fixed income securities, available-for-sale 1,302 6,851
Sale of short-term investments 434,865 695,313
Redemption and maturities of fixed income securities, held-to-maturity 9,396 28,644
Redemption and maturities of fixed income securities, available-for-sale 104,358 124,975
Sale of equity securities, available-for-sale 61,523 0
Distributions from other investments 5,704 3,447
Purchase of property and equipment (5,699) (3,673)
Sale of renewal rights 8,000 0
Net cash used in investing activities (27,683) (99,112)
Financing Activities    
Dividends to stockholders (6,948) (6,824)
Acquisition of treasury stock (2,653) (3,176)
Net proceeds from stock purchase and compensation plans 1,261 1,164
Proceeds from issuance of notes payable, net of debt issuance costs 0 178,623
Repayment of notes payable 0 (100,000)
Excess tax benefits from share-based payment arrangements 770 1,271
Repayments of capital lease obligations (459) 0
Net cash (used in) provided by financing activities (8,029) 71,058
Net increase in cash 52 86
Cash, beginning of year 193 210
Cash, end of period $ 245 $ 296