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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Accounts receivable, allowance for doubtful accounts $ 13,158 $ 13,358
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 1,665,217 1,325,049
Consolidated VIEs [Member]    
ASSETS    
Consolidated VIEs, Assets $ 390,300 $ 426,900
LIABILITIES AND STOCKHOLDERS' EQUITY    
Consolidated VIEs, Liabilities $ 45,100 $ 81,800
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 47,291,463 47,291,463
Common stock, shares outstanding 45,626,246 45,966,414
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