CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Receivables:
Insurance premiums and other, allowance for doubtful accounts	$ 379	$ 405
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	4,000,000	4,000,000
Preferred stock, shares issued (in shares)	70,000	70,000
Preferred stock, shares outstanding (in shares)	70,000	70,000
Preferred stock, redemption value	$ 7,000	$ 7,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	22,400,894	22,400,894
Common stock, shares outstanding (in shares)	21,216,542	21,274,241
Treasury stock, at cost (in shares)	1,184,352	1,126,653