Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Allowance for doubtful accounts $ 6,422 $ 7,545 $ 6,718
Accumulated depreciation for property, plant and equipment $ 293,008 $ 275,886 $ 264,615
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0 0
Preferred stock, shares outstanding (in shares) 0 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0 $ 0
Common stock, shares authorized (in shares) 125,000,000 125,000,000 125,000,000
Common stock, shares issued (in shares) 33,796,000 33,638,000 34,001,000
Common stock, shares outstanding (in shares) 33,796,000 33,638,000 34,001,000