CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 2,657	$ 3,770
Membership units, units issued (in units)	2,000
Membership units, units outstanding (in units)	2,000
Common stock, par value (in dollars per share)		$ 0.001
Common stock, shares authorized		2,000
Common stock, shares issued		2,000
Common stock, shares outstanding		2,000