CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts	$ 1,668	$ 1,883
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	20,000	20,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	120,000	120,000
Common stock, shares outstanding	52,528	52,017
Treasury stock, shares	231	115
Long Term Debt Current
Term loan, discount	206	116
Long Term Debt Noncurrent
Term loan, discount	$ 367	$ 328