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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Class of Stock [Line Items]    
Allowances for receivables $ 32,560 $ 32,396
Common Class A [Member]    
Class of Stock [Line Items]    
Common stock par value per share $ 0.001 $ 0.001
Common stock shares authorized 400,000,000 400,000,000
Common stock shares issued 29,101,656 29,307,583
Common Class B [Member]    
Class of Stock [Line Items]    
Common stock par value 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 [Member]    
Class of Stock [Line Items]    
Common stock par value 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 [Member]    
Class of Stock [Line Items]    
Treasury stock shares 260,627 227,638