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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Current assets:    
Accounts receivable, allowance for doubtful accounts $ 5,805 $ 5,369
Stockholders' equity:    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 200,000 200,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Treasury Stock, Shares 876,744 993,565
Consolidated VIEs [Member]    
ASSETS    
Consolidated VIEs, Assets $ 226,198 $ 119,908
LIABILITIES AND STOCKHOLDERS' EQUITY    
Consolidated VIEs, Liabilities $ 39,196 $ 40,715
Class A Common Stock [Member]    
Stockholders' equity:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 31,621,369 31,621,369
Common stock, shares outstanding 30,744,625 30,627,804
Class B Common Stock [Member]    
Stockholders' equity:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 0 0
Common stock, shares outstanding 0 0
Class C Common Stock [Member]    
Stockholders' equity:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 5,000,000 5,000,000
Common stock, shares issued 0 0
Common stock, shares outstanding 0 0