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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Noncurrent assets:    
Finite-Lived Intangible Assets, Accumulated Amortization $ (309,690) $ (302,345)
Common stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 4,000,000,000 4,000,000,000
Class A common stock    
Common stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 1,600,000,000 1,600,000,000
Common stock, shares issued (in shares) 54,006,419 53,663,859
Common stock, shares outstanding (in shares) 48,474,101 48,131,541
Class B convertible common stock    
Common stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 800,000,000 800,000,000
Common stock, shares issued (in shares) 47,687,039 47,687,039
Common stock, shares outstanding (in shares) 47,687,039 47,687,039
Class C common stock    
Common stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 800,000,000 800,000,000
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0
Class D common stock    
Common stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 800,000,000 800,000,000
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0
Preferred stock    
Preferred stock    
Preferred Stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0