CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 1,871	$ 3,083
Deposits and other assets, restricted (in dollars)	448	442
Convertible senior notes, discount (in dollars)	3,099	9,494
Senior secured notes, premium (in dollars)	$ 5,423	$ 0
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	47,334,218	47,116,644
Common stock, shares outstanding	47,334,218	47,116,644