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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 4,921 $ 5,329
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 50,000,000 50,000,000
Preferred Stock, Shares Issued 0 0
Preferred Stock, Shares Outstanding 0 0
Class A Common Stock    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 350,000,000 350,000,000
Common Stock, Shares, Issued 80,176,078 78,956,555
Common Stock, Shares, Outstanding 80,176,078 78,956,555
Class A-2 Common Stock    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 40,000,000 40,000,000
Common Stock, Shares, Issued 0 0
Common Stock, Shares, Outstanding 0 0
Class B Common Stock    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 150,000,000 150,000,000
Common Stock, Shares, Issued 26,026,843 26,026,843
Common Stock, Shares, Outstanding 26,026,843 26,026,843