Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets [Abstract]
Accounts and other receivables, allowance for doubtful accounts and sales returns	$ 3,354	$ 3,552
Common stock, no par value
Common stock, shares issued	32,240,987	32,069,370
Common stock, shares outstanding	32,240,987	32,069,370