Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 666	$ 616
Accumulated depreciation and amortization	$ 21,729	$ 17,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	2,000,000	2,000,000
Common stock, shares issued	40,949	40,729
Treasury stock, shares at cost	4,211	3,281