CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 1,759	$ 3,083
Deposits and other assets, restricted (in dollars)	438	442
Convertible senior notes, discount (in dollars)	$ 7,947	$ 9,494
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	47,173,444	47,116,644
Common stock, shares outstanding	47,173,444	47,116,644