Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.8.0.1
Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 3,951 $ 2,468
Preferred stock, par value (in dollars per share) $ 1.000 $ 1.000
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued, (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 1.000 $ 1.000
Common stock, shares authorized (in shares) 125,000,000 125,000,000
Common stock, shares issued (in shares) 87,153,085 86,062,191
Common stock, shares outstanding (in shares) 83,180,401 81,087,353
Treasury stock (in shares) 3,972,684 4,974,838