Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 2,813	$ 2,519
Preferred stock, Series B Senior Convertible, par value (in dollars per share)	$ 10.00	$ 10.00
Preferred stock, Series B Senior Convertible, shares authorized	2,500,000	2,500,000
Preferred stock, Series B Senior Convertible, shares issued	343,082	319,174
Preferred stock, Series B Senior Convertible, shares outstanding	343,082	319,174
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	19,243,262	18,118,290
Common stock, shares outstanding	18,893,173	17,804,459