Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Accounts receivable, allowance	$ 2,828	$ 2,273
Other acquired intangibles, accumulated amortization	$ 103,635	$ 93,009
Shareholders’ equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares (in shares)	5,000,000	5,000,000
Preferred stock, issued shares (in shares)	0	0
Preferred stock, outstanding shares (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	50,000,000	50,000,000
Common stock, issued shares (in shares)	26,958,243	27,316,434
Common stock, outstanding shares (in shares)	26,958,243	27,316,434