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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowances for receivables $ 35,738 $ 34,889
Common class A    
Class of Stock [Line Items]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares, issued 31,592,841 30,295,457
Common class B    
Class of Stock [Line Items]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares, issued 555,556 555,556
Common class C    
Class of Stock [Line Items]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares, issued 58,967,502 58,967,502
Treasury stock    
Class of Stock [Line Items]    
Treasury stock, shares 256,151 229,824