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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Accounts and other receivables, allowance for doubtful accounts and sales returns $ 3,036 $ 2,937
Common stock, no par value (shares)
Common stock, shares authorized (shares) 150,000,000 150,000,000
Common stock, shares, issued (shares) 33,365,039 33,176,024
Common stock, shares, outstanding (shares) 33,365,039 33,176,024
Common stock held in trust for savings restoration plan (shares) 74,798 72,883