Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v3.7.0.1
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Allowance for doubtful accounts $ 8,666 $ 8,556 $ 7,338
Accumulated depreciation for property, plant and equipment $ 435,625 $ 408,676 $ 390,100
Preferred stock, shares authorized (in shares) 10,000 10,000 10,000
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) 250,000 250,000 250,000
Common stock, shares issued (in shares) 69,686 69,873 69,729
Common stock, shares outstanding (in shares) 69,686 69,873 69,729