CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Receivables:
Insurance premiums and other, allowance for doubtful accounts	$ 280	$ 528
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)	55,000	55,000
Preferred stock, shares outstanding (in shares)	55,000	55,000
Preferred stock, redemption value	$ 5,500	$ 5,500
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)	20,446,705	20,426,536
Treasury stock, at cost (in shares)	1,954,189	1,974,358