XML 20 R6.htm IDEA: XBRL DOCUMENT v3.8.0.1
Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Common stock, par value (in usd per share) $ 2 $ 2
Common stock, authorized (shares) 200,000,000 200,000,000
Common stock, issued (shares) 61,476,000 61,031,000
Commons stock, outstanding (shares) 61,476,000 61,031,000