Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Allowance for Doubtful Accounts Receivable	$ 3,370	$ 2,927
Statement [Line Items]
Common stock par value (in dollars per share)	$ 0.001	$ 0.001
Authorized shares, common (shares)	300,000,000	300,000,000
Issued shares, common (shares)	55,933,403	55,486,651
Outstanding shares, common (shares)	55,933,403	55,486,651
Series A Redeemable Convertible Preferred Stock [Member]
Statement [Line Items]
Preferred stock par value (in dollars per share)	$ 0.001	$ 0.001
Authorized shares, preferred (shares)	10,000,000	10,000,000
Issued shares, preferred (shares)	0	0
Outstanding shares, preferred (shares)	0	0