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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Accounts and other receivables, allowance for doubtful accounts and sales returns $ 3,165 $ 3,036
Common stock, no par value
Common stock, shares issued 33,510,714 33,365,039
Common stock, shares outstanding 33,510,714 33,365,039
Common Stock, Shares Held in Employee Trust, Shares 75,200 74,798