CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, par value
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 125	$ 125
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	48,756,000	48,727,000
Common stock, shares outstanding	48,756,000	48,727,000