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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 30,000,000 30,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury Stock, shares outstanding (in shares) 521,876 0
Class A Stock
   
Stockholders' equity:    
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized (in shares) 40,000,000 40,000,000
Common Stock, shares issued (in shares) 1,998,785 2,020,481
Common Stock, shares outstanding (in shares) 1,998,785 2,020,481
Common Stock
   
Stockholders' equity:    
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized (in shares) 160,000,000 160,000,000
Common Stock, shares issued (in shares) 99,545,307 97,666,814
Common Stock, shares outstanding (in shares) 99,545,307 97,666,814