Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (unaudited) (Parenthetical)

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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts $ 7,795 $ 7,516
Long-term debt, fair value $ 607,301 $ 658,839
Series A common stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares, issued (in shares) 101,319,919 101,306,716
Common stock, shares, outstanding (in shares) 101,319,919 101,306,716
Series B common stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares, issued (in shares) 4,488,829 4,437,593
Common stock, shares, outstanding (in shares) 4,488,829 4,437,593
Series C Common Stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,040,000,000 1,040,000,000
Common stock, shares, issued (in shares) 0 0
Common stock, shares, outstanding (in shares) 0 0