CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Allowance for Doubtful Accounts Receivable	$ 29,381	$ 28,469
Stockholders' Equity
Preferred stock, par value per share	$ 100	$ 100
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares issued	0	0
Common stock, par value per share	$ 1.00	$ 1.00
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	258,551,748	257,822,352
Treasury Stock, shares	114,249,432	112,905,810