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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts $ 16,018 $ 12,701
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 95,000,000 95,000,000
Common stock, shares issued (in shares) 44,346,630 47,654,929
Common stock, shares outstanding (in shares) 44,346,630 47,654,929
Series A Preferred Stock    
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 6,000 6,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Series B Preferred Stock    
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 20,000 20,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0