CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Receivables, allowance for doubtful accounts	$ 5,081	$ 4,622
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	95,000,000	95,000,000
Common stock, issued	50,630,000	50,381,000
Common stock, outstanding	44,379,000	44,152,000
Treasury stock, shares	6,251,000	6,229,000
Senior Notes
Deferred financing costs	$ 2,713	$ 2,873