Consolidated Statements of Cash Flow (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities
Net income	$ 47,315	$ 48,430
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	18,912	23,103
Sale of renewal rights	(8,000)	0
Loss on disposal of discontinued operations	0	997
Stock-based compensation expense	6,102	6,189
Undistributed (gains) losses of equity method investments	(138)	419
Net realized gains	(11,757)	(8,509)
Retirement income plan curtailment expense	0	16
Changes in assets and liabilities:
Increase in reserve for loss and loss expenses, net of reinsurance recoverables	93,675	69,790
Increase in unearned premiums, net of prepaid reinsurance and advance premiums	36,997	65,225
Decrease in net federal income taxes	12,634	3,171
Increase in premiums receivable	(64,747)	(84,135)
Increase in deferred policy acquisition costs	(9,106)	(9,555)
Increase in interest and dividends due or accrued	(361)	(1,066)
Decrease in accrued salaries and benefits	(26,557)	(6,173)
Decrease in accrued insurance expenses	(16,872)	(5,478)
Other-net	(5,425)	(4,526)
Net adjustments	25,357	49,468
Net cash provided by operating activities	72,672	97,898
Investing Activities
Purchase of fixed income securities, available-for-sale	(339,362)	(530,402)
Purchase of equity securities, available-for-sale	(111,886)	(42,546)
Purchase of other investments	(6,039)	(4,393)
Purchase of short-term investments	(764,692)	(1,116,873)
Sale of subsidiary	0	1,225
Sale of fixed income securities, available-for-sale	19,557	6,851
Sale of short-term investments	772,455	1,144,853
Redemption and maturities of fixed income securities, held-to-maturity	28,595	48,186
Redemption and maturities of fixed income securities, available-for-sale	222,568	286,905
Sale of equity securities, available-for-sale	111,996	42,206
Distributions from other investments	7,726	6,077
Purchase of property and equipment	(6,628)	(6,761)
Sale of renewal rights	8,000	0
Net cash used in investing activities	(57,710)	(164,672)
Financing Activities
Dividends to stockholders	(13,914)	(13,668)
Acquisition of treasury stock	(2,786)	(3,285)
Net proceeds from stock purchase and compensation plans	3,091	3,769
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	955	1,467
Repayments of capital lease obligations	(954)	0
Net cash (used in) provided by financing activities	(13,608)	66,718
Net increase (decrease) in cash	1,354	(56)
Cash, beginning of year	193	210
Cash, end of period	$ 1,547	$ 154