Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets
Available-for-sale, amortized cost	$ 1,431,049	$ 1,294,350
Held-to-maturity, fair value	687	11,868
Trading, amortized cost	0	6
Equity securities available-for-sale, cost	218,848	240,287
Premiums and reinsurance balances receivable, allowances for uncollectible amounts	13,328	13,470
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts	14,239	14,834
Property and equipment, accumulated depreciation	$ 41,491	$ 45,603
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	65,912,638	65,455,462
Common stock, shares outstanding (in shares)	42,982,424	42,525,248
Treasury stock, shares (in shares)	22,930,214	22,930,214