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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts $ 24,418 $ 27,973
Preferred stock par value $ 0.0001 $ 0.0001
Preferred stock authorized 7,500,000 7,500,000
Preferred stock issued 0 0
Preferred stock outstanding 0 0
Common Class A [Member]    
Common stock par value $ 0.0001 $ 0.0001
Common stock authorized 80,000,000 80,000,000
Common stock issued 24,230,448 23,971,808
Common stock outstanding 24,230,326 23,971,686
Common Class B [Member]    
Common stock par value $ 0.0001 $ 0.0001
Common stock authorized 20,000,000 20,000,000
Common stock issued 5,130,558 5,098,799
Common stock outstanding 5,129,641 5,097,882
Treasury Class-A [Member]    
Treasury Stock, Shares 122 122
Treasury Class B [Member]    
Treasury Stock, Shares 917 917