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Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Trade receivables, related parties $ 4,483 $ 4,530
Trade receivables, allowance for doubtful accounts 2,799 3,395
Prepaid expenses and other current assets 13,621 10,672
Property and equipment, accumulated depreciation 185,731 187,375
Accumulated amortization of Intangible assets 98,373 93,793
Intangible assets subject to amortization, net 18,019 22,598
Accounts payable and accrued expenses 46,766 51,034
Unamortized debt issuance costs 2,600 2,709
Related Parties    
Prepaid expenses and other current assets 274 274
Intangible assets subject to amortization, net 7,406 8,327
Accounts payable and accrued expenses $ 2,277 $ 1,948
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 60,268,985 63,210,531
Common stock, shares outstanding 60,268,985 63,210,531
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