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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]    
Allowance for doubtful accounts $ 5,409 $ 5,197
Debt issuance costs $ 4,801 $ 5,007
Common stock, shares issued (in shares) 17,986,121  
Common stock, shares outstanding (in shares) 17,841,970  
Treasury stock, shares (in shares) 144,151 68,658
Class A common stock    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (usd per share) $ 0.00000001 $ 0.00000001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 16,097,836 15,750,097
Common stock, shares outstanding (in shares) 15,953,685 15,681,439
Class B Common Stock    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (usd per share) $ 0.00000001 $ 0.00000001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 1,888,285 1,926,848
Common stock, shares outstanding (in shares) 1,888,285 1,926,848
6.75% Senior Notes    
Condensed Financial Statements, Captions [Line Items]    
Debt issuance costs $ 6,726 $ 6,938
Interest rate 6.75% 6.75%