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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2014
Dec. 31, 2013
Allowances for receivables $ 39,698 $ 48,401
Shares held in treasury 227,638 1,402,227
Common Class A [Member]    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 29,307,583 29,504,379
Common Class B [Member]    
Common stock, par value $ 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]    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 58,967,502 58,967,502