CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,188	$ 2,402
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock authorized (in shares)	500,000	500,000
Preferred stock issued (in shares)	0	0
Preferred stock outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	30,000,000	30,000,000
Common stock issued (in shares)	25,755,000	25,555,000
Treasury stock (in shares)	7,722,000	7,717,000