CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts receivable:
Trade, allowance for doubtful accounts	$ 1,814	$ 1,945
STOCKHOLDERS' EQUITY:
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, authorized shares (in shares)	50,000	50,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.15	$ 0.15
Common stock, authorized shares (in shares)	28,000,000	28,000,000
Common stock, issued shares (in shares)	9,047,450	9,044,525
Common stock held in trust, at cost (in shares)	512,372	512,372
Treasury stock, at cost (in shares)	103,460	103,460