CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Balance Sheet Parenthetical [Abstract]
Trade, allowance for doubtful accounts	$ 1,766	$ 1,592
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)	9,021,158	9,022,888
Common stock held in trust, at cost (in shares)	512,372	428,596
Treasury stock, at cost (in shares)	103,460	103,460