Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Trade accounts receivable, allowance for doubtful accounts (in Dollars)	$ 2,772	$ 1,171
Total assets of variable interest entities(VIE) (in Dollars)	41,100	24,900
Total liabilities of VIEs (in Dollars)	$ 10,600	$ 3,500
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares outstanding (in Dollars per share)	$ 0	$ 0
Voting Common Stock [Member]
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	87,695,495	47,802,816
Nonvoting Common Stock [Member]
Common stock, shares authorized	400,000,000
Common stock, shares issued	828,885