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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Trade receivables, allowance $ 5,659 $ 4,845
Class A Common Stock    
Common stock par value (in USD per share) $ 0.0001 $ 0.0001
Common stock authorized (in shares) 400,000,000 400,000,000
Common stock issued (in shares) 84,644,774 84,644,774
Common stock outstanding (in shares) 84,644,774 84,644,774
Class B Common Stock    
Common stock par value (in USD per share) $ 0.0001 $ 0.0001
Common stock authorized (in shares) 100,000,000 100,000,000
Common stock issued (in shares) 8,024,419 8,024,419
Common stock outstanding (in shares) 8,024,419 8,024,419