Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts and other receivables, allowance for doubtful accounts and sales returns	$ 2,797	$ 1,904
Common stock, no par value (shares)
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares, issued (shares)	33,457,176	33,365,039
Common stock, shares, outstanding (shares)	33,457,176	33,365,039
Common stock held in trust for savings restoration plan (shares)	105,067	74,798