Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v3.10.0.1
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Allowance for doubtful accounts $ 6,889 $ 9,043 $ 8,666
Accumulated depreciation for property, plant and equipment $ 472,447 $ 455,811 $ 435,625
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) 250,000 125,000 125,000
Common stock, shares issued (in shares) 69,988 69,995 69,686
Common stock, shares outstanding (in shares) 69,988 69,995 69,686