Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Trade accounts receivable, allowance for doubtful accounts	$ 4,944	$ 4,848
Common shares, par value	$ 0.10	$ 0.10
Common shares, authorized	50,000,000	50,000,000
Common shares, issued	19,836,937	19,423,874
Common shares, outstanding	19,836,937	19,423,874