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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]    
Allowance for doubtful accounts $ 6,405 $ 5,197
Debt issuance costs $ 4,625 $ 5,007
Common stock, shares issued (in shares) 20,492,236  
Common stock, shares outstanding (in shares) 20,318,014  
Treasury stock, shares (in shares) 174,222 68,658
Class A common stock    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (usd per share) $ 0.0000001 $ 0.0000001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 17,917,636 15,750,097
Common stock, shares outstanding (in shares) 17,743,414 15,681,439
Class B Common Stock    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (usd per share) $ 0.0000001 $ 0.0000001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 2,574,600 1,926,848
Common stock, shares outstanding (in shares) 2,574,600 1,926,848
6.75% Senior Notes    
Condensed Financial Statements, Captions [Line Items]    
Debt issuance costs $ 6,509 $ 6,938
Interest rate 6.75% 6.75%