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)	$ 2,593	$ 2,464
Deposits and other assets, restricted (in dollars)	463	462
Convertible senior notes, discount (in dollars)	$ 16,758	$ 20,758
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	45,842,335	45,838,510
Common stock, shares outstanding	45,842,335	45,838,510