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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts and other receivables, allowance for doubtful accounts and sales returns $ 2,922 $ 2,610
Common stock, no par value
Common stock, shares issued 32,673,712 32,422,082
Common stock, shares outstanding 32,673,712 32,422,082
Common Stock, Shares Held in Employee Trust, Shares 67,155 66,255