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Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Trade receivables, related parties $ 5,356 $ 4,653
Trade receivables, allowance for doubtful accounts 3,167 2,566
Prepaid expenses and other current assets 11,990 6,260
Property and equipment, accumulated depreciation 184,093 179,869
Accumulated amortization of Intangible assets 90,562 87,632
Intangible assets subject to amortization, net 25,828 26,758
Accounts payable and accrued expenses 52,787 57,563
Unamortized debt issuance costs 3,513 3,761
Related Parties    
Prepaid expenses and other current assets 274 274
Intangible assets subject to amortization, net 8,941 9,555
Accounts payable and accrued expenses $ 1,920 $ 2,548
Class A common stock    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 260,000,000 260,000,000
Common stock, shares issued 64,554,155 66,069,325
Common stock, shares outstanding 64,554,155 66,069,325
Class B common stock    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 14,927,613 14,927,613
Common stock, shares outstanding 14,927,613 14,927,613
Class U common stock    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 9,352,729 9,352,729
Common stock, shares outstanding 9,352,729 9,352,729