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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Trade accounts receivable, allowance for doubtful accounts (in Dollars) $ 2,683 $ 2,772
Total assets of variable interest entities(VIE) (in Dollars) 38,900 41,100
Total liabilities of VIEs (in Dollars) $ 8,800 $ 10,600
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares outstanding 0 0
Preferred stock, par value (in Dollars per share) $ 0 $ 0
Voting Common Stock [Member]
   
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 87,749,273 87,695,495
Common stock, par value (in Dollars per share) $ 0 $ 0
Nonvoting Common Stock [Member]
   
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 828,885 828,885
Common stock, par value (in Dollars per share) $ 0 $ 0