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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
Treasury stock, shares 6,061,503 6,061,503
Preferred stock, par value (USD per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares outstanding 0 0
Class A Common Stock [Member]    
Common stock, par value (USD per share) $ 0.001 $ 0.001
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares outstanding 97,816,106 97,781,933
Class B common stock [Member]    
Common stock, par value (USD per share) $ 0.001 $ 0.001
Common stock, shares authorized 1,000,000 1,000,000
Common stock, shares outstanding 27 28