UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) [Abstract]
Trade accounts receivable, allowances for doubtful accounts	$ 4,685	$ 3,540
Other intangibles, accumulated amortization	22,813	19,603
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, outstanding (in shares)	14,105,360	14,079,608
Series A Preferred Stock [Member]
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) [Abstract]
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, aggregate liquidation preference	112	112
Preferred Stock, issued (in shares)	1,122	1,122
Preferred Stock, designated (in shares)	1,122	1,122
Preferred Stock, outstanding (in shares)	1,122	1,122
Series B Preferred Stock [Member]
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, stated value	100	100
Preferred stock, aggregate liquidation preference	$ 1,500	$ 1,500
Preferred Stock, issued (in shares)	15,000	15,000
Preferred Stock, designated (in shares)	15,000	15,000
Preferred Stock, outstanding (in shares)	15,000	15,000